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| 2020 Decadal Survey in Astronomy and Astrophysics | |
|---|---|
| Name | 2020 Decadal Survey in Astronomy and Astrophysics |
| Date | 2020–2021 |
| Commission | National Academies of Sciences, Engineering, and Medicine |
| Also known as | Astro2020 |
| Subject | Prioritization of astronomy and astrophysics projects |
2020 Decadal Survey in Astronomy and Astrophysics was the community-driven priority setting exercise led by the National Academies of Sciences, Engineering, and Medicine to guide United States federal investment in astronomy and astrophysics for the 2020s. The report, commonly called Astro2020, evaluated scientific opportunities across exoplanet studies, cosmology, time-domain astronomy, and multi-messenger astronomy to recommend large strategic missions, mid-scale projects, and programmatic balance for agencies such as the National Aeronautics and Space Administration, the National Science Foundation, and the Department of Energy. It built on prior decadal surveys including the Astronomy and Astrophysics Decadal Survey (2010) and the New Worlds, New Horizons (2010) process while responding to developments from observatories and missions like Hubble Space Telescope, James Webb Space Telescope, Kepler mission, Transiting Exoplanet Survey Satellite, Chandra X-ray Observatory, Fermi Gamma-ray Space Telescope, LIGO, and Virgo (gravitational-wave observatory).
Astro2020 was organized by the Space Studies Board and the Board on Physics and Astronomy under the National Academies of Sciences, Engineering, and Medicine and involved panels convened with members drawn from institutions such as Harvard University, California Institute of Technology, Massachusetts Institute of Technology, University of California, Berkeley, Princeton University, Stanford University, University of Cambridge, Max Planck Society, Institut d'Astrophysique de Paris, National Radio Astronomy Observatory, and the European Southern Observatory. The survey followed the community model set by earlier exercises like the Decadal Survey on Biological and Physical Sciences and incorporated input via white papers from organizations including the American Astronomical Society, American Physical Society, Royal Astronomical Society, and international partners such as Japan Aerospace Exploration Agency, European Space Agency, and Canadian Space Agency. Panels assessed scientific promise, technical readiness, cost, and risk, referencing facilities such as Atacama Large Millimeter/submillimeter Array, Very Large Telescope, Square Kilometre Array, and missions like Euclid (spacecraft), Nancy Grace Roman Space Telescope, and Gaia (spacecraft).
The report identified high-priority science themes emphasizing searches for exoplanet biosignatures, mapping cosmic structure to probe dark matter and dark energy, understanding stellar and galactic evolution, and exploiting transient and multi-messenger signals from neutron star and black hole mergers. Astro2020 prioritized characterization of terrestrial exoplanets around M-dwarf and sun-like stars, informed by results from Kepler mission, K2, TESS, and spectroscopic follow-up from European Southern Observatory facilities. Cosmology priorities connected to investigations enabled by Cosmic Microwave Background experiments, surveys like Dark Energy Survey and Sloan Digital Sky Survey, and theoretical frameworks associated with Lambda-CDM model and alternatives explored by researchers at Institute for Advanced Study and Kavli Institute for Theoretical Physics.
The survey's top recommendation, the so-called "large" priority, was a strategic flagship observatory for exoplanet imaging capable of directly detecting Earth-like planets, endorsed as a successor in ambition to projects rooted in proposals from groups at NASA Goddard Space Flight Center, Jet Propulsion Laboratory, Space Telescope Science Institute, and concept studies like the Large UV/Optical/Infrared Surveyor lineage. The report also recommended a new "probe"-class astronomy mission line and prioritized investment in a new mid-scale ground-based facility for optical/infrared astronomy, expansions to radio facilities such as Next Generation Very Large Array, enhancements to LIGO-class detectors, and community access to data archives like those at Mikulski Archive for Space Telescopes. Mid-scale priorities included upgrades to ALMA, development of wide-field spectroscopic capabilities inspired by projects like DESI, and support for computational infrastructure via collaborations with National Energy Research Scientific Computing Center and NASA Advanced Supercomputing Division.
Astro2020 laid out programmatic balance across agencies: flagship investment to be led by NASA with contributions from the National Science Foundation and the Department of Energy for cosmology and instrumentation, while ground-based priorities would rely on NSF funding lines and public-private partnerships involving institutions such as Associated Universities, Inc. and AURA. The report emphasized cost realism and recommended independent cost and technical evaluations akin to those performed by Cost Analysis and Review (CAS) boards and the Government Accountability Office for major projects such as James Webb Space Telescope. It advocated sustaining portfolio diversity through competed mid-scale solicitations and ensuring workforce development supported by agencies, universities, and initiatives like the NSF Graduate Research Fellowship Program.
The astronomy and astrophysics communities, including membership organizations like the American Astronomical Society, International Astronomical Union, and stakeholders at centers such as Space Telescope Science Institute and National Radio Astronomy Observatory, broadly received the report as a roadmap, while debates arose over priorities, cost caps, and timeline realism voiced in editorials in outlets such as Nature (journal), Science (journal), and responses from national laboratories like Los Alamos National Laboratory and Lawrence Berkeley National Laboratory. International partners including European Space Agency, Japan Aerospace Exploration Agency, Canadian Space Agency, and agencies in India and China considered alignment with missions such as Euclid (spacecraft) and bilateral collaborations around facilities like ALMA and SKA Organization.
Key milestones tracked the release of the report and subsequent implementation steps: report release and endorsement by the National Academies of Sciences, Engineering, and Medicine; agency responses and prioritization by NASA and NSF during budget cycles influenced by the United States Congress appropriations process; selection studies at centers including Jet Propulsion Laboratory and NASA Goddard Space Flight Center; and project-specific milestones for missions traversing Phase A to Phase D reviews and launch decisions like those for Nancy Grace Roman Space Telescope and probe-class solicitations. Parallel community milestones included funding announcements from programs such as NSF's Mid-scale Research Infrastructure and prototype technology demonstrations at institutions like MIT Lincoln Laboratory.
Astro2020's legacy includes setting strategic priorities that will shape observatory roadmaps at NASA, NSF, and partner agencies, influencing career trajectories at universities like Caltech, Columbia University, University of Chicago, Yale University, University of Arizona, and research institutes such as Swinburne University of Technology and Max Planck Institute for Astronomy. Its recommendations inform future decadal exercises and international coordination with European Southern Observatory, SKA Organization, and national programs in Japan and Canada, and will guide technological development in coronagraphy, starshades, high-contrast imaging, cryogenic detectors, and large-scale data analysis at facilities such as National Radio Astronomy Observatory and CERN. The survey's emphasis on broad, balanced portfolios and workforce development aims to sustain discovery in exoplanet biosignature detection, precision cosmology, and multi-messenger astrophysics through the 2030s and beyond.
Category:Astronomy reports