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U.S. Astronomy and Astrophysics: Managing an Integrated Program
Microlensing of distant stars by intervening faint stars can reveal planets in orbit around the lensing star.
The main technique used by astronomers to map sources at high resolution and to measure their positions with high precision.
Kuiper Belt objects (KBOs)—
Icy planetesimals distributed in a roughly circular disk in the outer regions of our solar system, 50 to 100 AU from the Sun.
Radiation from an approaching object is shifted to higher frequencies (to the blue), while radiation from a receding object is shifted to lower frequencies (to the red). A similar effect raises the pitch of an ambulance siren as it approaches. The expansion of the universe makes objects recede so that the light from distant galaxies is redshifted. The redshift is often denoted by z, where z=v/c and v is the velocity and c the speed of light.
Astronomy and Astrophysics Planning Board
NRC Astronomy and Astrophysics Survey Committee
Advisory Committee for AST (NSF Astronomical Sciences Division)
AURA Coordinating Council of Observatory Research Directors
Atacama Large Millimeter Array
Advanced Radio Interferometry between Space and Earth
Advanced Solar Telescope (now called the Advanced Technology Solar Telescope, or ATST); NSF Astronomical Sciences Division
NSF Division of Atmospheric Sciences
Associated Universities for Research in Astronomy, Inc.
NRC Committee on Astronomy and Astrophysics
Combined Array for Research in Millimeter-wave Astronomy
Compton Gamma-Ray Observatory
Committee on the Organization and Management of Research in Astronomy and Astrophysics