Extraterrestrial life, or alien life, is life which does not originate from Earth. No extraterrestrial life has yet been scientifically conclusively detected. Such life might range from simple forms such as prokaryotes to intelligent beings, possibly bringing forth civilizations that might be far more advanced than humans. The Drake equation speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as astrobiology.
Terraforming or terraformation ("Earth-shaping") is the hypothetical process of deliberately modifying the atmosphere, temperature, surface topography or ecology of a planet, moon, or other body to be similar to the environment of Earth to make it habitable for humans to live on.
An atmosphere is a layer of gases that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A stellar atmosphere is the outer region of a star, which includes the layers above the opaque photosphere; stars of low temperature might have outer atmospheres containing compound molecules.
In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical and geological events and circumstances. According to the hypothesis, complex extraterrestrial life is an improbable phenomenon and likely to be rare throughout the universe as a whole. The term "Rare Earth" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.
This is a timeline of astronomy. It covers ancient, medieval, Renaissance-era, and finally modern astronomy.
Extraterrestrial is a British-American two-part television documentary miniseries, aired in 2005 in the UK by Channel 4, by the National Geographic Channel in the US on Monday, May 30, 2005 and produced by Big Wave Productions Ltd. The program focuses on the hypothetical and scientifically feasible evolution of alien life on extrasolar planets, providing model examples of two different fictional worlds, one in each of the series's two episodes.
Planet Earth is a 2006 British television series produced by the BBC Natural History Unit. Five years in the making, it was the most expensive nature documentary series ever commissioned by the BBC and also the first to be filmed in high definition. The series received multiple awards, including four Emmy Awards, a Peabody Award, and an award from the Royal Television Society.
There is evidence that the formation of the Solar System began about 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.
Brian Edward Cox is an English physicist and musician who is a professor of particle physics in the School of Physics and Astronomy at the University of Manchester and the Royal Society Professor for Public Engagement in Science. He is best known to the public as the presenter of science programmes, especially BBC Radio 4’s The Infinite Monkey Cage and the Wonders of... series and for popular science books, such as Why Does E=mc2? and The Quantum Universe.
Human Planet is an 8-part British television documentary series. It is produced by the BBC with co-production from France Televisions Discovery and BBC Worldwide. It describes the human species and its relationship with the natural world by showing the remarkable ways humans have adapted to life in every environment on Earth. The show drew attention for alleged fakery and the BBC eventually acknowledged that a number of scenes were inaccurately depicted or misleading and withdrew the series from distribution.
Universe Sandbox is a series of interactive space sandbox gravity simulator educational software video games. Using Universe Sandbox, users can see the effects of gravity on objects in the universe and run scale simulations of the Solar System, various galaxies or other simulations, while at the same time interacting and maintaining control over gravity, time, and other objects in the universe, such as moons, planets, asteroids, comets, and black holes. The original Universe Sandbox was only available for Windows-based PCs, but an updated version was released for Windows, macOS, and Linux in 2015.
An Earth analog, also called an Earth analogue, Earth twin, or second Earth, is a planet or moon with environmental conditions similar to those found on Earth. The term Earth-like planet is also used, but this term may refer to any terrestrial planet.
Planet Earth is a seven-episode 1986 PBS television documentary series focusing on the Earth, narrated by Richard Kiley.
Wonders of the Universe is a 2011 television series produced by the BBC, Discovery Channel, and Science Channel, hosted by physicist Professor Brian Cox. Wonders of the Universe was first broadcast in the United Kingdom on BBC Two from 6 March 2011. The series comprises four episodes, each of which focuses on an aspect of the universe and features a 'wonder' relevant to the theme. It follows on from Cox's 2010 series for the BBC, Wonders of the Solar System. An accompanying book with the same title was also published.
Stargazing Live is a British live television programme on astronomy that was broadcast yearly on BBC Two over three nights every winter from 2011 to 2017. The series was primarily presented by scientist Brian Cox and comedian and amateur astronomer Dara Ó Briain with support from TV presenter and biochemist Liz Bonnin and astronomer Mark Thompson. For the first six series, the show was broadcast from Jodrell Bank Observatory in Cheshire, and featured live links from scientific facilities in locations such as Hawaii, South Africa, and Norway. The seventh series in 2017 was broadcast from Siding Spring Observatory in Australia, and a special episode filmed at Kennedy Space Center was broadcast in July 2019 to celebrate the 50th anniversary of the Apollo 11 mission.
The following outline is provided as an overview of and topical guide to the Solar System:
Wonders of Life is a 2013 television documentary series presented by physicist Brian Cox. The series was produced by the BBC and Chinese state television network CCTV-9 and aired in the United Kingdom from 27 January 2013 at 9:00 pm on BBC Two. An accompanying book with the same title was also published.
Human Universe is a British television series broadcast on BBC Two, presented by Professor Brian Cox. An accompanying book was also published.
Planet Earth II is a 2016 British nature documentary series produced by the BBC as a sequel to Planet Earth, which was broadcast in 2006. The series is presented and narrated by Sir David Attenborough with the main theme music composed by Hans Zimmer.
