The Astronomy and Astrophysics Decadal Survey is a review of astronomy and astrophysics literature produced approximately every ten years by the National Research Council of the National Academy of Sciences in the United States. The report surveys the current state of the field, identifies research priorities, and makes recommendations for the coming decade. The decadal survey represents the recommendations of the research community to governmental agencies on how to prioritize scientific funding within astronomy and astrophysics. The editing committee is informed by topical panels and subcommittees, dedicated conferences, and direct community input in the form of white papers summarizing the state of the art in each subdiscipline. The most recent report, Astro2020, was released in 2021. [1] [2] [3] [4]
The first report, Ground-Based Astronomy: A Ten-Year Program, was released in 1964. [5] The authoring committee was chaired by Albert Whitford. The report recommends construction of national observing facilities, including especially mid-sized ground-based optical telescopes. [6] [7]
The second report, Astronomy and Astrophysics for the 1970s, was released in 1972. [8] The committee was chaired by Jesse L. Greenstein. It recommends priorities for both space- and ground-based programs, and was instrumental in the eventual construction of the Very Large Array. [6] [7]
The third report, Astronomy and Astrophysics for the 1980s, was released in 1982. [7] The committee was chaired by George B. Field. It recommended the launch of the "Advanced X-Ray Astrophysics Facility", which was realized in 1999 as the Chandra X-ray Observatory. [9] It also identified construction of the Very Long Baseline Array as a priority, in addition to briefly mentioning the Hubble Space Telescope (before it received that name) and the Shuttle Infrared Telescope Facility (later Spitzer). [6]
The fourth report, The Decade of Discovery in Astronomy and Astrophysics, was released in 1991. [10] The committee was chaired by John N. Bahcall. It recommended the launch of the "Space Infrared Telescope Facility", realized in 2003 as the Spitzer Space Telescope, [11] the fourth and final in NASA's Great Observatories program.
The fifth report, Astronomy and Astrophysics in the New Millennium, was released in 2001. [12] The committee was co-chaired by Christopher McKee and Joseph H. Taylor. It gives highest priority to the construction and launch of Next Generation Space Telescope, now known as the James Webb Space Telescope which launched on 25 December 2021. [13] The report reaffirms the 1991 recommendation for the completion of the Millimeter Array, now part of the Atacama Large Millimeter Array international collaboration. It also examines the benefits of a robust astronomy research program to the nation, and expresses concern regarding the percentage of funding tied to a few large projects. [14]
The sixth report, New Worlds, New Horizons in Astronomy and Astrophysics, was released in 2010. The committee was chaired by Roger D. Blandford. Recommendations for scientific questions to be answered include: the nature of dark energy; the structure, distribution, and evolution of exoplanetary systems; detailed examination of extreme processes including supernovae and the merger of superdense objects; and how galaxies and galaxy clusters formed from the early hot universe. [15] : 7 The report also examines technical readiness, scheduling, and funding issues as well as basic science. The recommendations consider a range of funding scenarios based on projected budgets for the major funding agencies, NASA, the National Science Foundation, and the Department of Energy. The top priorities identified by the report include:
Other priorities include Laser Interferometer Space Antenna (LISA) for measuring gravitational waves and International X-ray Observatory for investigating black holes and the evolution of large scale structure in the universe. The report also recommends augmenting the Explorer program for small and medium-sized missions with rapid turnaround and high scientific return, and the creation of a Midscale Innovations Program within the National Science Foundation for funding projects in the $4–135 million range. [15] [17]
The seventh report, released to the public at 11 am ET on Thursday, November 4, 2021, recommended scientific priorities and investments for the next decade to help achieve the following primary goals: search for habitable exoplanets and extraterrestrial life, study black holes and neutron stars and study the growth and evolution of galaxies. The top priority recommended to the NSF was to combine the Thirty Meter Telescope and Giant Magellan Telescope programs into one United States Extremely Large Telescope program. The top priority recommended to NASA was to establish a new Great Observatories Mission and Technology Maturation program that would conduct studies into 2030s-launched telescopes, with a hybrid of LUVOIR (successor to Hubble) and HabEx (successor to Spitzer) as the first major project with an estimated cost of US$11 billion, to be followed by cheaper far-infrared astronomy and X-ray astronomy designs (the Origins Space Telescope and Lynx X-ray Observatory) with an estimated cost from US$3 billion to US$5 billion each. [18] [19] [1]
A space telescope is a telescope in outer space used to observe astronomical objects. Suggested by Lyman Spitzer in 1946, the first operational telescopes were the American Orbiting Astronomical Observatory, OAO-2 launched in 1968, and the Soviet Orion 1 ultraviolet telescope aboard space station Salyut 1 in 1971. Space telescopes avoid several problems caused by the atmosphere, including the absorption or scattering of certain wavelengths of light, obstruction by clouds, and distortions due to atmospheric refraction such as twinkling. Space telescopes can also observe dim objects during the daytime, and they avoid light pollution which ground-based observatories encounter. They are divided into two types: Satellites which map the entire sky, and satellites which focus on selected astronomical objects or parts of the sky and beyond. Space telescopes are distinct from Earth imaging satellites, which point toward Earth for satellite imaging, applied for weather analysis, espionage, and other types of information gathering.
Infrared astronomy is a sub-discipline of astronomy which specializes in the observation and analysis of astronomical objects using infrared (IR) radiation. The wavelength of infrared light ranges from 0.75 to 300 micrometers, and falls in between visible radiation, which ranges from 380 to 750 nanometers, and submillimeter waves.
The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space telescope launched in 2003, that was deactivated when operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder.
The National Optical Astronomy Observatory (NOAO) was the United States national observatory for ground-based nighttime ultraviolet-optical-infrared (OUVIR) astronomy. The National Science Foundation (NSF) funded NOAO to provide forefront astronomical research facilities for US astronomers. Professional astronomers from any country in the world could apply to use the telescopes operated by NOAO under the NSF's "open skies" policy.
NASA's series of Great Observatories satellites are four large, powerful space-based astronomical telescopes launched between 1990 and 2003. They were built with different technology to examine specific wavelength/energy regions of the electromagnetic spectrum: gamma rays, X-rays, visible and ultraviolet light, and infrared light.
The Center for Astrophysics | Harvard & Smithsonian (CfA), previously known as the Harvard–Smithsonian Center for Astrophysics, is an astrophysics research institute jointly operated by the Harvard College Observatory and Smithsonian Astrophysical Observatory. Founded in 1973 and headquartered in Cambridge, Massachusetts, United States, the CfA leads a broad program of research in astronomy, astrophysics, Earth and space sciences, as well as science education. The CfA either leads or participates in the development and operations of more than fifteen ground- and space-based astronomical research observatories across the electromagnetic spectrum, including the forthcoming Giant Magellan Telescope (GMT) and the Chandra X-ray Observatory, one of NASA's Great Observatories.
Llano de Chajnantor Observatory is the name for a group of astronomical observatories located at an altitude of over 4,800 m (15,700 ft) in the Atacama Desert of northern Chile. The site is in the Antofagasta Region approximately 50 kilometres (31 mi) east of the town of San Pedro de Atacama. The exceptionally arid climate of the area is inhospitable to humans, but creates an excellent location for millimeter, submillimeter, and mid-infrared astronomy. This is because water vapour absorbs and attenuates submillimetre radiation. Llano de Chajnantor is home to the largest and most expensive astronomical telescope project in the world, the Atacama Large Millimeter Array (ALMA). Llano de Chajnantor and the surrounding area has been designated as the Chajnantor Science Reserve by the government of Chile.
Associated Universities, Inc. (AUI) is a research management corporation that builds and operates facilities for the research community. It is a not-for-profit 501(c)(3) corporation headquartered in Washington, D.C., United States. The current president is Adam Cohen. The corporation's major current operating unit is the National Radio Astronomy Observatory, which it operates under a Cooperative Agreement with the National Science Foundation.
The Gould Belt Survey is an astronomical research project led by the Center for Astrophysics | Harvard & Smithsonian, with the participation of several other institutions.
NASA's large strategic science missions or large strategic missions, formerly known as Flagship missions or Flagship-class missions, are the costliest and most capable NASA science spacecraft. Flagship missions exist within all four divisions of NASA's Science Mission Directorate (SMD): the astrophysics, Earth science, heliophysics and planetary science divisions.
The Nancy Grace Roman Space Telescope (shortened as Roman or the Roman Space Telescope, and formerly the Wide-Field Infrared Survey Telescope or WFIRST) is a NASA infrared space telescope in development and scheduled to launch to a Sun–Earth L2 orbit by May 2027.
The Planetary Science Decadal Survey is a serial publication of the United States National Research Council produced for NASA and other United States Government Agencies such as the National Science Foundation. The documents identify key questions facing planetary science and outlines recommendations for space and ground-based exploration ten years into the future. Missions to gather data to answer these big questions are described and prioritized, where appropriate. Similar decadal surveys cover astronomy and astrophysics, earth science, and heliophysics.
The Cerro Chajnantor Atacama Telescope (CCAT) is a proposed 25 metres (82 ft) diameter telescope that is intended to reveal the cosmic origins of stars, planets, and galaxies with its submillimeter cameras and spectrometers enabled by superconducting detector arrays. The telescope was originally called the Cornell Caltech Atacama Telescope, but due to lack of funding the 25 metre telescope is currently on hold.
Patrick Thaddeus was an American professor and finished his career as the Robert Wheeler Willson Professor of Applied Astronomy Emeritus at Harvard University. He is best known for mapping carbon monoxide in the Milky Way galaxy and was responsible for the construction of the CfA 1.2 m Millimeter-Wave Telescope.
The Large Ultraviolet Optical Infrared Surveyor, commonly known as LUVOIR, is a multi-wavelength space telescope concept being developed by NASA under the leadership of a Science and Technology Definition Team. It is one of four large astrophysics space mission concepts studied in preparation for the National Academy of Sciences 2020 Astronomy and Astrophysics Decadal Survey.
The Habitable Exoplanet Observatory (HabEx) is a space telescope concept that would be optimized to search for and image Earth-size habitable exoplanets in the habitable zones of their stars, where liquid water can exist. HabEx would aim to understand how common terrestrial worlds beyond the Solar System may be and determine the range of their characteristics. It would be an optical, UV and infrared telescope that would also use spectrographs to study planetary atmospheres and eclipse starlight with either an internal coronagraph or an external starshade.
Origins Space Telescope (Origins) is a concept study for a far-infrared survey space telescope mission. A preliminary concept in pre-formulation, it was presented to the United States Decadal Survey in 2019 for a possible selection to NASA's large strategic science missions. Origins would provide an array of new tools for studying star formation and the energetics and physical state of the interstellar medium within the Milky Way using infrared radiation and new spectroscopic capabilities.
The Lynx X-ray Observatory (Lynx) is a NASA-funded Large Mission Concept Study commissioned as part of the National Academy of Sciences 2020 Astronomy and Astrophysics Decadal Survey. The concept study phase is complete as of August 2019, and the Lynx final report has been submitted to the Decadal Survey for prioritization. If launched, Lynx would be the most powerful X-ray astronomy observatory constructed to date, enabling order-of-magnitude advances in capability over the current Chandra X-ray Observatory and XMM-Newton space telescopes.