Rendezvous with the Future

Last updated
Rendezvous with the Future
Rendezvous with the Future - Bilibili poster.jpeg
Also known as未来漫游指南
GenreScience, technology
Directed byDavid Briggs
Starring Liu Cixin
Composers
  • Jim Cornick
  • Matt Loveridge
Original languagesEnglish, Chinese
No. of seasons1
No. of episodes3
Production
Executive producerSteve Crabtree
Running time50 minutes
Production companiesBilibili, BBC Studios
Original release
NetworkBilibili
ReleaseNovember 2022 (2022-11)

Rendezvous with the Future is a documentary series commissioned by Bilibili and produced by BBC Studios which explores the science behind the science fiction of author Liu Cixin. [1] The series premiered in China on 16 November 2022 [2] and has been watched by a combined audience of more than 75 million. [3]

Contents

Reception

The series won 'China Story: Best Documentary Series' Award at the 2023 Guangzhou International Documentary Film Festival. The jury panel commented: “This dazzling series impressed the jury with its extraordinary visual creativity. A wonderful master interview brought mankind's biggest issues to life in a thought provoking and imaginative way, opening our minds to the universe and its infinite scientific possibilities.” [4] The series also won 'Best SVOD popular series' and 'Most innovative work' at the 2023 China Documentary Festival Awards [5] as well as 'Best Composer' at the 2023 Royal Television Society West of England Awards. [6]

Episodes

The series comprises three 50-minute episodes, each focusing on a particular theme from Mr Liu's science fiction.

1. First Contact

"Contact with an alien civilisation has many possibilities. It might have a good outcome. Equally it might have terrible consequences. Any child knows not to open the door to strangers. They know not to greet strangers casually. This is a matter of common sense." — Liu Cixin [7]

In this episode, Liu Cixin explores the different possibilities for how first contact with an alien civilisation might happen.

The programme begins with the dilemma posed in Liu Cixin's novel The Three-Body Problem: if humanity receives a message from aliens, should we reply? For the fictional character Ye Wenjie, the answer is 'yes' and Douglas Vakoch who is President of METI International shares the same view. His organisation creates and transmits interstellar messages in an attempt to communicate with extraterrestrial civilisations. [8] At the EISCAT facility in Norway, Vakoch explains how a radar transmitter could be used to broadcast a reply. [7] He proposes that the message could be similar in design to previous attempts to communicate with other civilisations across the galaxy, such as the Arecibo Message. [9] [10] [11]

Astronomer Frank Drake describes the historic Project Ozma in which he used the 85-foot Howard E. Tatel telescope at the National Radio Astronomy Observatory in Green Bank to search for possible radio transmissions from two star systems Epsilon Eridani and Tau Ceti. [12] Referenced in The Three-Body Problem, it is generally recognised as humanity's first attempt to detect interstellar radio transmissions. [13]

Astronomer Li Di describes the background to the construction of the Five-hundred-meter Aperture Spherical Telescope [14] which is the largest filled-aperture radio telescope in the world. Li explains the different approaches they are taking in SETI. [15] He is Principal Investigator of the Commensal Radio Astronomy FasT Survey - a multipurpose 'drift-scan' survey of the sky which will use 500 hours of telescope time per year and will take approximately 10 years to complete. [16] FAST is also being used to conduct bespoke searches of nearby star systems with exoplanets identified by the Transiting Exoplanet Survey Satellite. [17]

The search for extraterrestrial intelligence has so far focused primarily on electromagnetic signals in radio or microwave frequencies [18] since this is the form of interstellar communication that human civilisation first became capable of. [19] In 2017, astronomers began searching for optical transmissions in the form of laser pulses. [20] But Liu Cixin's novel The Dark Forest explores the possibility of communication based on more exotic physics such as gravitational waves or neutrinos. [18] [21]

Some scientists have argued that LIGO is already capable of detecting artificially generated gravitational wave signals. [22] Caltech experimental physicist Rana Adhikari outlines the design of a terrestrial gravitational wave transmitter that could give human civilisation the capability of transmitting a gravitational wave message to nearby stars. [7] [23] [24] [25]

Another possibility is that first contact takes place through the detection of alien technology. The theoretical physicist Freeman Dyson advocated expanding SETI to detect hypothesised alien megastructures such as Dyson Spheres. [26] Closer to home, a number of scientists have argued that the Solar System should be searched for evidence of alien artifacts. [27] [28] [29] [30] [31]

Astrobiologist Jacob Haqq Misra describes the discovery of the interstellar object, 'Oumuamua. [32] Its intriguing characteristics prompted speculation that it might be an alien space probe. But no radio transmissions were detected emanating from the object [33] and further study determined it to be of entirely natural origin. [34]

Astronomer Jill Tarter describes her involvement in drafting one of the first post-detection protocols, establishing principles for what should be done in the event of the detection of extraterrestrial intelligence. [35] The discovery of an apparent signal or alien technology is likely to have a high degree of uncertainty and many factors will impact its potential significance. [36] [37]

2. Voyage to the Stars

"I think if humans want to survive, our only choice is to expand our living space in the universe. Like H.G. Wells once said: Human beings will either fill the universe or perish completely. There is no other choice." — Liu Cixin [38]

In this second episode, Liu Cixin explores the possibility of interstellar travel and how humankind could settle other star systems.

Scientists such as Stephen Hawking argued that the colonisation of space is necessary to mitigate the risks of human extinction from natural or human-made disasters. [39] The Dark Forest Hypothesis, outlined in Liu Cixin's novel The Dark Forest, provides another reason to settle other star systems to ensure the long-term survival of human civilisation.

The programme begins with an interview with Dr Dario Izzo of the European Space Agency's Advanced Concepts Team. He describes the 10th edition of the Global Trajectory Optimisation Competition in which 73 teams [40] from around the world competed to find the most efficient approach for galactic settlement using future hypothetical technology such as Generation Ships. [41] The winning solution achieved the settlement of approximately 3,100 stars across the galaxy in 90 million years. [42]

The programme then explores some of the key 'breakthrough' technologies referenced in Liu Cixin's novel The Dark Forest. [43]

Physicist Bradley Edwards describes the concept of the space elevator - a system that could transport material from the surface of Earth into geostationary orbit. [44] Edwards argues that a key reason that humankind has not yet built vast structures in Earth orbit is economic. For example, the construction of the International Space Station relied on conventional chemical rockets and cost $150 billion (in 2010 dollars) making it one of the most expensive objects ever built. [45] In contrast, Edwards argues, a space elevator would be able transport materials into space at lower cost - potentially playing a crucial role in the construction of large spaceships assembled in Earth Orbit.

A second significant challenge for interstellar travel is the design of the spaceship's Life-Support System. Unlike the International Space Station which receives regular supplies from Earth, [46] an interstellar spaceship travelling through deep space will need to be an entirely closed system independent of Earth. Jane Poynter describes how Biosphere 2 attempted to create a partially closed system, by duplicating many of Earth's natural processes.

Mr Liu proposes that a third major 'breakthrough' technology is nuclear fusion. There are many different approaches being tested to achieve controlled nuclear fusion. [47] The ITER experiment currently being assembled in southern France is based on the tokamak design. [48] But at Princeton Plasma Physics Laboratory, engineer Stephanie Thomas and plasma physicist Samuel Cohen are testing an early prototype of the Direct Fusion Drive experiment. In this design, nuclear fusion is used to directly generate thrust. A ‘Fusion Drive’ is described in Liu Cixin's novel Death's End. [49]

Finally, the programme explores the challenge of how a human crew might survive a voyage that would likely last well beyond the human lifespan. One solution is that it is not the original crew that reaches the destination, but their descendants. This is the concept of the Generation Ship - a ship that carries generations upon generations that live and die onboard the vessel. Liu Cixin references this in his celebrated fictional 'Letter to My Daughter'. [50]

Another proposed solution, widely explored in science fiction, is to extend the human lifespan through artificial hibernation or suspended animation. Professor Jon Rittenberger describes experimental studies he carried out at the Applied Physiology Laboratory at the University of Pittsburgh in which the core body temperature of nine healthy volunteers was lowered by around 3 °C for 3 hours with medication used to suppress shivering. [51] The results achieved were consistent with an estimated reduction in metabolic rate of between 20% and 25%. In comparison, hibernating mammals reduce their metabolic rate by 80% to 98%. [52] Rittenberger advocates that ‘shallow’ reductions in the metabolic rate could find an application in interplanetary spaceflight. [53] [52]

3. Becoming a Supercivilisation

"The characteristics of a supercivilisation are that it uses technology to enhance its evolution to become a more powerful species. Second, the energy that a supercivilisation can use must be really huge. Third, it must have gone a long way on this path of understanding the laws of the universe. But a technologically advanced supercivilisation cannot be a civilisation with only ideas. It must have left its own mark on the universe. It must have spread to places of considerable distance." - Liu Cixin [54]

In the final episode, Liu Cixin explores what the far future has in store and how humanity could become a technologically advanced supercivilisation.

In 1964, the Soviet astronomer Nikolai Kardashev proposed a means of ranking the advancement of a civilisation according to the amount of energy it can access. [55] Kardashev categorised a Type I civilisation as one that utilises the energy of all the starlight falling on its planet; a Type II civilisation utilises the entire energy of its star; and a Type III civilisation utilises the energy of its entire galaxy. [56]

Mathematician and philosopher Stuart Armstrong discusses how humanity could become a Type II supercivilisation through the construction of a Dyson Sphere around the Sun. [26] [57] Armstrong suggests that sufficient material could be obtained by disassembling the Planet Mercury. By using AI-assisted technology and a 'recursive manufacturing loop', he estimates that construction of the Dyson Sphere could be completed within approximately 30 years. [58] Liu Cixin is sceptical of the Dyson Sphere concept and believes broader criteria for a supercivilisation are required.

Liu Cixin suggests that a second attribute of a supercivilisation is that it must use technology to enhance its evolution to become a more powerful species. AI researcher Xu Li discusses the path towards the development of artificial superintelligence and argues that AI will play an increasingly important role in scientific discovery. [54]

A third criteria Liu Cixin proposes is that a supercivilisation should have made great progress in its scientific understanding of the universe. Today, one of the greatest mysteries in cosmology concerns the existence of dark matter. Physicist Laura Manenti introduces the XENON dark matter experiment at the Laboratori Nazionali del Gran Sasso which she hopes will allow scientists to better understand the properties of dark matter. At CERN, particle physicist James Beacham discusses the far future of experiments in high energy physics and the idea of building a particle accelerator spanning the entire 10,900 km circumference of the Moon. [59] Liu Cixin's science fiction novel Death's End describes the possibility of an even larger ‘circumsolar’ particle accelerator constructed in orbit around the Sun. [60] Beacham speculates about how such an experiment might be realised in practice and whether it could ultimately reach the Holy Grail of particle physics - the Planck Energy. [54]

Liu Cixin's final criteria of a supercivilisation is that it must have spread to places of considerable distance across the universe. [61] His science fiction novel Death's End features the idea of 'curvature propulsion' [62] which may have been inspired [63] by the Alcubierre drive proposed in 1994 by theoretical physicist Miguel Alcubierre. [64] Physicist and historian James Woodward describes another speculative idea: using the principle of inertia to generate thrust through the hypothesied 'Mach Effect'. [65] [66] Woodward suggests that the same physics could allow the artificial creation of wormholes and potentially realise the possibility of space travel across galaxies. [67] [68] [69]

Related Research Articles

<span class="mw-page-title-main">Drake equation</span> Estimate of extraterrestrial civilizations

The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way Galaxy.

<span class="mw-page-title-main">Fermi paradox</span> Lack of evidence that aliens exist

The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now."

The search for extraterrestrial intelligence (SETI) is a collective term for scientific searches for intelligent extraterrestrial life, for example, monitoring electromagnetic radiation for signs of transmissions from civilizations on other planets.

<span class="mw-page-title-main">Bussard ramjet</span> Proposed spacecraft propulsion method

The Bussard ramjet is a theoretical method of spacecraft propulsion for interstellar travel. A fast moving spacecraft scoops up hydrogen from the interstellar medium using an enormous funnel-shaped magnetic field ; the hydrogen is compressed until thermonuclear fusion occurs, which provides thrust to counter the drag created by the funnel and energy to power the magnetic field. The Bussard ramjet can thus be seen as a ramjet variant of a fusion rocket.

<span class="mw-page-title-main">Kardashev scale</span> Measure of a civilizations evolution

The Kardashev scale is a method of measuring a civilization's level of technological advancement based on the amount of energy it is capable of using. The measure was proposed by Soviet astronomer Nikolai Kardashev (1932–2019) in 1964 and was named after him.

The fission sail is a type of spacecraft propulsion proposed by Robert Forward that uses fission fragments to propel a large solar sail-like craft. It is similar in concept to the fission-fragment rocket in that the fission by-products are directly harnessed as working mass, and differs primarily in the way that the fragments are used for thrust.

<span class="mw-page-title-main">Communication with extraterrestrial intelligence</span> Branch of SETI

The communication with extraterrestrial intelligence (CETI) is a branch of the search for extraterrestrial intelligence (SETI) that focuses on composing and deciphering interstellar messages that theoretically could be understood by another technological civilization. The best-known CETI experiment of its kind was the 1974 Arecibo message composed by Frank Drake.

<span class="mw-page-title-main">Stellar engine</span> Class of hypothetical megastructures

Stellar engines are a class of hypothetical megastructures which use the resources of a star to generate available work. For instance, they can use the energy of the star to produce mechanical, electrical or chemical work or they can use the impulse of the light emitted by the star to produce thrust, able to control the motion of a star system. The concept has been introduced by Bădescu and Cathcart. The variants which produce thrust may accelerate a star and anything orbiting it in a given direction. The creation of such a system would make its builders a type-II civilization on the Kardashev scale.

An interstellar war is a hypothetical space war between combatants from different planetary systems. The concept provides a common plot device in science fiction, especially in the space opera subgenre. In contrast, the term intergalactic war refers to war between combatants from different galaxies, and interplanetary war refers to war between combatants from different planets of the same planetary system.

<span class="mw-page-title-main">Bracewell probe</span> Hypothetical space probe

A Bracewell probe is a hypothetical concept for an autonomous interstellar space probe dispatched for the express purpose of communication with one or more alien civilizations. It was proposed by Ronald N. Bracewell in a 1960 paper, as an alternative to interstellar radio communication between widely separated civilizations.

<span class="mw-page-title-main">Avi Loeb</span> Israeli-American theoretical physicist

Abraham "Avi" Loeb is an Israeli-American theoretical physicist who works on astrophysics and cosmology. Loeb is the Frank B. Baird Jr. Professor of Science at Harvard University, where since 2007 he has been Director of the Institute for Theory and Computation at the Center for Astrophysics. He chaired the Department of Astronomy from 2011–2020, and founded the Black Hole Initiative in 2016.

Active SETI is the attempt to send messages to intelligent extraterrestrial life. Active SETI messages are predominantly sent in the form of radio signals. Physical messages like that of the Pioneer plaque may also be considered an active SETI message. Active SETI is also known as METI.

<span class="mw-page-title-main">Interstellar object</span> Astronomical object not gravitationally bound to a star

An interstellar object is an astronomical object in interstellar space that is not gravitationally bound to a star. This term can also be applied to an object that is on an interstellar trajectory but is temporarily passing close to a star, such as certain asteroids and comets. In the latter case, the object may be called an interstellar interloper.

The cultural impact of extraterrestrial contact is the corpus of changes to terrestrial science, technology, religion, politics, and ecosystems resulting from contact with an extraterrestrial civilization. This concept is closely related to the search for extraterrestrial intelligence (SETI), which attempts to locate intelligent life as opposed to analyzing the implications of contact with that life.

<span class="mw-page-title-main">Technosignature</span> Property that provides scientific evidence for the presence of technology

Technosignature or technomarker is any measurable property or effect that provides scientific evidence of past or present technology. Technosignatures are analogous to biosignatures, which signal the presence of life, whether intelligent or not. Some authors prefer to exclude radio transmissions from the definition, but such restrictive usage is not widespread. Jill Tarter has proposed that the search for extraterrestrial intelligence (SETI) be renamed "the search for technosignatures". Various types of technosignatures, such as radiation leakage from megascale astroengineering installations such as Dyson spheres, the light from an extraterrestrial ecumenopolis, or Shkadov thrusters with the power to alter the orbits of stars around the Galactic Center, may be detectable with hypertelescopes. Some examples of technosignatures are described in Paul Davies's 2010 book The Eerie Silence, although the terms "technosignature" and "technomarker" do not appear in the book.

<span class="mw-page-title-main">ʻOumuamua</span> Interstellar object discovered in 2017

ʻOumuamua is the first interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope at Haleakalā Observatory, Hawaii, on 19 October 2017, approximately 40 days after it passed its closest point to the Sun on 9 September. When it was first observed, it was about 33 million km from Earth and already heading away from the Sun.

METI International, known simply as METI, is a non-profit research organization founded in July 2015 by Douglas Vakoch that creates and transmits interstellar messages to attempt to communicate with extraterrestrial civilizations. It is based in San Francisco, California.

<span class="mw-page-title-main">Douglas Vakoch</span> American pro-contact astrobiologist (born 1961)

Douglas A. Vakoch is an American astrobiologist, search for extraterrestrial intelligence (SETI) researcher, psychologist, and president of METI International, a nonprofit research and educational organization devoted to transmitting intentional signals to extraterrestrial civilizations. Vakoch led METI's participation in Sónar Calling GJ 273b, which transmitted a series of interstellar messages to Luyten's Star, located 12.4 light years from Earth. Vakoch advocates ongoing transmission projects, arguing that this does not increase risks of an alien invasion as suggested by British cosmologist Stephen Hawking. He has participated in several SETI observation programs, and after sixteen years at the SETI Institute, where he was director of Interstellar Message Composition, Vakoch founded METI International. He has edited over a dozen books in SETI, astrobiology, the psychology of space exploration, and ecocriticism. He is general editor of two-book series in ecocriticism and in the intersection of space and society. Vakoch has appeared widely on television and radio as a commentator on SETI and astrobiology. He is an emeritus professor of clinical psychology at the California Institute of Integral Studies (CIIS).

<span class="mw-page-title-main">Alberto Caballero (astronomer)</span> Spanish astronomer (born c. 1991)

Alberto Caballero is a Spanish astronomer and science communicator. He is known for having identified a Sun-like star in the sky region where the Wow! signal came from as one of the possible sources of the radio signal. Caballero is also known for founding and coordinating the Habitable Exoplanet Hunting Project, an international effort consisting of more than 30 observatories searching for nearby potentially habitable exoplanets. Data is collected 24/7 from specific stars by observatories located both in the Northern and Southern hemispheres, and an initial list of exoplanet candidates was made public in 2020.

The Galileo Project is an international scientific research project to systematically search for extraterrestrial intelligence or extraterrestrial technology on and near Earth and to identify the nature of anomalous Unidentified Flying Objects/Unidentified Aerial Phenomena (UFOs/UAP).

References

  1. ↑ "BBC Studios and China's Bilibili announce new documentary series Ancients, revealing the dramatic story of early civilisations to Chinese audiences". www.bbc.co.uk. Retrieved 2023-02-13.
  2. ↑ "Rendezvous with the Future". IMDb.
  3. ↑ 哔哩哔哩番剧. "未来漫游指南". www.bilibili.com (in Simplified Chinese). Retrieved 2023-02-13.
  4. ↑ "Winners of the Golden Kapok Award Competition announced". Guangzhou International Documentary Film Festival. 2023. Retrieved 13 December 2023.
  5. ↑ "The 29th China Documentary Academic Festival". China Television Artists Association. 2023.
  6. ↑ "Royal Television Society West of England Awards 2023". Royal Television Society. 29 November 2022.
  7. 1 2 3 "Rendezvous with the Future: Episode 1 - First Contact". bilibili. 2022.
  8. ↑ Vakoch, Douglas (2017). "The message we're sending to nearby aliens is no threat to Earth". New Scientist.
  9. ↑ Dumas, Stephane (2015). "Message to Extra-Terrestrial Intelligence - a historical perspective". The SETI League Canada.
  10. ↑ The Staff at the National Astronomy and Ionosphere Center (1975-12-01). "The Arecibo message of November, 1974". Icarus. 26 (4): 462–466. Bibcode:1975Icar...26..462.. doi:10.1016/0019-1035(75)90116-5. ISSN   0019-1035.
  11. ↑ Heidmann, Jean (1993-03-01). "A reply from Earth: Just send them the encyclopaedia". Acta Astronautica. 29 (3): 233–235. Bibcode:1993AcAau..29..233H. doi:10.1016/0094-5765(93)90053-Y. ISSN   0094-5765.
  12. ↑ Drake, F. D. (1961-04-01). "Project Ozma". Physics Today. 14 (4): 40–46. Bibcode:1961PhT....14d..40D. doi:10.1063/1.3057500. ISSN   0031-9228.
  13. ↑ "Project Ozma". SETI Institute.
  14. ↑ Nan, Rendong; Li, Di (2013-04-23). "The five-hundred-meter aperture spherical radio telescope (FAST) project". IOP Conference Series: Materials Science and Engineering. 44 (1): 012022. arXiv: 1612.09372 . Bibcode:2013MS&E...44a2022N. doi:10.1088/1757-899X/44/1/012022. ISSN   1757-8981.
  15. ↑ Li, Di; Gajjar, Vishal; Wang, Pei; Siemion, Andrew; Zhang, Zhi-Song; Zhang, Hai-Yan; Yue, You-Ling; Zhu, Yan; Jin, Cheng-Jin; Li, Shi-Yu; Berger, Sabrina; Brzycki, Bryan; Cobb, Jeff; Croft, Steve; Czech, Daniel (2020-05-01). "Opportunities to search for extraterrestrial intelligence with the FAST". Research in Astronomy and Astrophysics. 20 (5): 078. Bibcode:2020RAA....20...78L. doi:10.1088/1674-4527/20/5/78. hdl: 2066/219294 . ISSN   1674-4527. S2CID   219484234.
  16. ↑ "The Commensal Radio Astronomy FAST Survey (CRAFTS)" (PDF). National Astronomical Observatories, Chinese Academy of Sciences.
  17. ↑ Zhang, Zhi-Song; Werthimer, Dan; Zhang, Tong-Jie; Cobb, Jeff; Korpela, Eric; Anderson, David; Gajjar, Vishal; Lee, Ryan; Li, Shi-Yu; Pei, Xin; Zhang, Xin-Xin; Huang, Shi-Jie; Wang, Pei; Zhu, Yan; Duan, Ran (2020-03-17). "First SETI Observations with China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST)". The Astrophysical Journal. 891 (2): 174. arXiv: 2002.02130 . Bibcode:2020ApJ...891..174Z. doi: 10.3847/1538-4357/ab7376 . ISSN   1538-4357. S2CID   211043944.
  18. 1 2 Hippke, Michael (2018-10-01). "Benchmarking information carriers". Acta Astronautica. 151: 53–62. Bibcode:2018AcAau.151...53H. doi:10.1016/j.actaastro.2018.05.038. ISSN   0094-5765. S2CID   115747885.
  19. ↑ Cocconi, Giuseppe; Morrison, Philip (1959). "Searching for Interstellar Communications". Nature. 184 (4690): 844–846. Bibcode:1959Natur.184..844C. doi:10.1038/184844a0. ISSN   0028-0836. S2CID   4220318.
  20. ↑ "Laser SETI". SETI Institute. 26 December 2022.
  21. ↑ Jackson, A. A. (2019-06-03). "A Neutrino Beacon". Journal of the British Interplanetary Society. 73 (1): 15. arXiv: 1905.05184 . Bibcode:2020JBIS...74...15J.
  22. ↑ Sellers, Luke; Bobrick, Alexey; Martire, Gianni; Andrews, Michael; Paulini, Manfred (2022-12-24). "Searching for Intelligent Life in Gravitational Wave Signals Part I: Present Capabilities and Future Horizons". arXiv: 2212.02065 [astro-ph.IM].
  23. ↑ Jackson, A. A.; Benford, Gregory (2018-06-21). "A Gravitational Wave Transmitter". arXiv: 1806.02334 [physics.pop-ph].
  24. ↑ Forgan, Duncan (2020). "A Dysonesque Gravitational Wave Generator".
  25. ↑ Shostak, Seth (2016). "Gravity Waves and ET". SETI Institute.
  26. 1 2 Dyson, Freeman J. (1960-06-03). "Search for Artificial Stellar Sources of Infrared Radiation". Science. 131 (3414): 1667–1668. Bibcode:1960Sci...131.1667D. doi:10.1126/science.131.3414.1667. ISSN   0036-8075. PMID   17780673. S2CID   3195432.
  27. ↑ Tough, Allen; Lemarchand, Guillermo A. (2004). "Searching for Extraterrestrial Technologies Within Our Solar System". Symposium - International Astronomical Union. 213: 487–490. doi: 10.1017/S0074180900193763 . ISSN   0074-1809.
  28. ↑ Freitas, Robert A.; Valdes, Francisco (1985-12-01). "The search for extraterrestrial artifacts (SETA)". Acta Astronautica. 12 (12): 1027–1034. Bibcode:1985AcAau..12.1027F. doi:10.1016/0094-5765(85)90031-1. ISSN   0094-5765.
  29. ↑ Papagiannis, Michael (1995). "The search for extraterrestrial technologies in our solar system". Progress in the Search for Extraterrestrial Life. 74: 425–431.
  30. ↑ Benford, James (2019-09-20). "Looking for Lurkers: Co-orbiters as SETI Observables". The Astronomical Journal. 158 (4): 150. Bibcode:2019AJ....158..150B. doi: 10.3847/1538-3881/ab3e35 . ISSN   1538-3881. S2CID   204184553.
  31. ↑ Arkhipov, Alexey (1995). "A Search for Alien Artifacts on the Moon". Progress in the Search for Extraterrestrial Life. 74: 259–264.
  32. ↑ Meech, Karen J.; Weryk, Robert; Micheli, Marco; Kleyna, Jan T.; Hainaut, Olivier R.; Jedicke, Robert; Wainscoat, Richard J.; Chambers, Kenneth C.; Keane, Jacqueline V.; Petric, Andreea; Denneau, Larry; Magnier, Eugene; Berger, Travis; Huber, Mark E.; Flewelling, Heather (2017). "A brief visit from a red and extremely elongated interstellar asteroid". Nature. 552 (7685): 378–381. Bibcode:2017Natur.552..378M. doi:10.1038/nature25020. ISSN   1476-4687. PMC   8979573 . PMID   29160305.
  33. ↑ Harp, G. R.; Richards, Jon; Jenniskens, Peter; Shostak, Seth; Tarter, Jill C. (2019-02-01). "Radio SETI observations of the interstellar object ′OUMUAMUA". Acta Astronautica. 155: 51–54. arXiv: 1808.09355 . doi:10.1016/j.actaastro.2018.10.046. ISSN   0094-5765. S2CID   55977434.
  34. ↑ Bannister, Michele T.; Bhandare, Asmita; Dybczyński, Piotr A.; Fitzsimmons, Alan; Guilbert-Lepoutre, Aurélie; Jedicke, Robert; Knight, Matthew M.; Meech, Karen J.; McNeill, Andrew; Pfalzner, Susanne; Raymond, Sean N.; Snodgrass, Colin; Trilling, David E.; Ye, Quanzhi; The ‘Oumuamua ISSI Team (2019). "The natural history of 'Oumuamua". Nature Astronomy. 3 (7): 594–602. arXiv: 1907.01910 . Bibcode:2019NatAs...3..594O. doi:10.1038/s41550-019-0816-x. ISSN   2397-3366. S2CID   201426621.
  35. ↑ "Declaration of principles concerning activities following the detection of extraterrestrial intelligence". Acta Astronautica. 21 (2): 153–154. 1990-02-01. Bibcode:1990AcAau..21..153.. doi:10.1016/0094-5765(90)90144-A. ISSN   0094-5765.
  36. ↑ Almár, Iván; Tarter, Jill (2011-02-01). "The discovery of ETI as a high-consequence, low-probability event". Acta Astronautica. SETI Special Edition. 68 (3): 358–361. Bibcode:2011AcAau..68..358A. doi:10.1016/j.actaastro.2009.07.007. ISSN   0094-5765.
  37. ↑ Forgan, Duncan; Wright, Jason; Tarter, Jill; Korpela, Eric; Siemion, Andrew; Almár, Iván; Piotelat, Elisabeth (2019). "Rio 2.0: revising the Rio scale for SETI detections". International Journal of Astrobiology. 18 (4): 336–344. Bibcode:2019IJAsB..18..336F. doi:10.1017/S1473550418000162. hdl: 10023/16927 . ISSN   1473-5504. S2CID   125560694.
  38. ↑ "Rendezvous with the Future: Episode 2 - Voyage to the Stars". bilibili. 2022.
  39. ↑ Highfield, Roger (26 April 2009). ""Colonies in space may be only hope, says Hawking"". The Telegraph. Archived from the original on 2009-04-26.
  40. ↑ "GTOC X Teams". NASA Jet Propulsion Laboratory.
  41. ↑ "GTOC X – Settlers of the Galaxy". European Space Agency. 2023.
  42. ↑ Ya-Zhong, Luo (2019). "GTOC X: Results and Methods of National University of Defense Technology and Xi'an Satellite Control Center" (PDF). Proceedings of AAS/AIAA Astrodynamics Specialist Conference.
  43. ↑ Liu, Cixin. The Dark Forest. Head of Zeus. pp. 214 "If there are breakthroughs in the two key technologies of phase one, the space elevator and controlled fusion— and there's hope of this in our lifetimes—then things will be better.”.
  44. ↑ Edwards, Bradley. The Space Elevator (PDF). NASA Institute for Advanced Concepts. pp. 1.4 "All of the launch costs for putting things in orbit from the space elevator would be a small fraction of what they currently are with rockets.".
  45. ↑ Walker, Robert (2015). "Is The International Space Station The Most Expensive Single Item Ever Built?". Science 2.0.
  46. ↑ "Life Support Systems: Sustaining Humans Beyond Earth". NASA. 13 July 2016.
  47. ↑ "Approaches to Fusion". U.S. Fusion Energy.
  48. ↑ "What is a tokamak?". ITER.
  49. ↑ Liu, Cixin. Death's End. Head of Zeus. pp. 393 "The plasma emitted by the nuclear fusion drive was tens of times hotter than the emissions of ancient chemical rockets.".
  50. ↑ Liu, Cixin; Field, Jesse (2020-01-02). "Letter to My Daughter". Chinese Literature Today. 9 (1): 4–7 "For starship explorers, these are all one-way journeys. Even though you all have long lives, these journeys are longer still, with itineraries lasting a thousand years or even ten thousand. I don't wish to make you live aboard a ship that's traveling forever, but I believe such a mission attracts you. Because you are my daughter.". doi:10.1080/21514399.2020.1750836. ISSN   2151-4399. S2CID   221059593.
  51. ↑ Rittenberger, Jon C.; Flickinger, Kathryn L.; Weissman, Alexandra; Repine, Melissa; Elmer, Jonathan; Guyette, Francis X.; Callaway, Clifton W. (2019-05-01). "Cooling to Facilitate Metabolic Suppression in Healthy Individuals". Aerospace Medicine and Human Performance. 90 (5): 475–479. doi:10.3357/AMHP.5284.2019. ISSN   2375-6314. PMC   7077737 . PMID   31023408.
  52. 1 2 Choukèr, A.; Bereiter-Hahn, Jürgen; Singer, D.; Heldmaier, G. (2018-12-19). "Hibernating astronauts—science or fiction?". Pflügers Archiv: European Journal of Physiology. 471 (6): 819–828. doi:10.1007/s00424-018-2244-7. ISSN   0031-6768. PMC   6533228 . PMID   30569200.
  53. ↑ Regan, Matthew D.; Flynn-Evans, Erin E.; Griko, Yuri V.; Kilduff, Thomas S.; Rittenberger, Jon C.; Ruskin, Keith J.; Buck, C. Loren (2020-03-01). "Shallow metabolic depression and human spaceflight: a feasible first step". Journal of Applied Physiology. 128 (3): 637–647. doi:10.1152/japplphysiol.00725.2019. ISSN   8750-7587. PMC   7099441 . PMID   31999524.
  54. 1 2 3 "Rendezvous with the Future: Episode 3 - Becoming A Supercivilisation". bilibili. 2022.
  55. ↑ Kardashev, N.S. (1964). "Transmission of information by extraterrestrial civilizations". Soviet Astronomy. 8 (2): 217–221. Bibcode:1964SvA.....8..217K.
  56. ↑ Kaku, Michio. Physics of the Future. pp. 329-330 "According to this classification, our present-day civilisation is Type 0. We don't even rate on this scale, since we get our energy from dead plants, that is, from oil and coal. Carl Sagan, generalising this classification, tried to get a more precise estimate of where we ranked on this cosmic scale. His calculation showed that we are actually a Type 0.7 civilisation.".
  57. ↑ Freeman, Dyson (1979). Disturbing the Universe. Basic Books. pp. 211 "Some science fiction writers have wrongly given me the credit of inventing the artificial biosphere. In fact, I took the idea from Olaf Stapledon, one of their own colleagues.". ISBN   978-0-465-01677-8.
  58. ↑ Armstrong, Stuart; Sandberg, Anders (2013-08-01). "Eternity in six hours: Intergalactic spreading of intelligent life and sharpening the Fermi paradox". Acta Astronautica. 89: 1–13. Bibcode:2013AcAau..89....1A. doi:10.1016/j.actaastro.2013.04.002. ISSN   0094-5765.
  59. ↑ Beacham, James; Zimmermann, Frank (2022-02-01). "A very high energy hadron collider on the Moon". New Journal of Physics. 24 (2): 023029. arXiv: 2106.02048 . Bibcode:2022NJPh...24b3029B. doi:10.1088/1367-2630/ac4921. ISSN   1367-2630. S2CID   235352517.
  60. ↑ Liu, Cixin (2016). Death's End. Head of Zeus. pp. 443 "“The circumsolar particle accelerator was capable of producing microscopic black holes rapidly, but these tiny black holes also evaporated very quickly. To produce a stable black hole, a microscopic black hole was guided out of the accelerator as soon as it was produced, and then injected into Leda.". ISBN   9781784971625.
  61. ↑ White, Harold G. "Sonny" (2021). "Limitless Space Institute Overview" (PDF). Advanced Research Projects Agency - Energy.
  62. ↑ Liu, Cixin (2016). Death's End. Head of Zeus. pp. 367 "Until Yun Tianming's message had been correctly interpreted, curvature propulsion remained a dream, like hundreds of other proposals for lightspeed spaceflight.". ISBN   9781784971625.
  63. ↑ Li, Miao (2015). Physics in Three-Body (in Chinese). Sichuan Science and Technology Press. p. 202. ISBN   978-7536480681.
  64. ↑ Alcubierre, Miguel (1994-05-01). "The warp drive: hyper-fast travel within general relativity". Classical and Quantum Gravity. 11 (5): L73–L77. arXiv: gr-qc/0009013 . doi:10.1088/0264-9381/11/5/001. ISSN   0264-9381. S2CID   250905936.
  65. ↑ Scoles, Sarah (2019). "The Good Kind of Crazy: The Quest for Exotic Propulsion". Scientific American. 321 (2): 58–65.
  66. ↑ Woodward, James (2020). "Mach Effect for In Space Propulsion: Interstellar Mission". NASA.
  67. ↑ Woodward, J.F. (2011). "Making Stargates: The Physics of Traversable Absurdly Benign Wormholes". Physics Procedia. 20: 24–46. Bibcode:2011PhPro..20...24W. doi: 10.1016/j.phpro.2011.08.003 .
  68. ↑ Morris, Michael S.; Thorne, Kip S. (1988-05-01). "Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity". American Journal of Physics. 56 (5): 395–412. Bibcode:1988AmJPh..56..395M. doi: 10.1119/1.15620 . ISSN   0002-9505.
  69. ↑ Foster, Brendan (2021). "Wormhole Tunnels in Spacetime May Be Possible, New Research Suggests". Scientific American.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.