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astronomy

(Encyclopedia)astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large. ...

radar astronomy

(Encyclopedia)radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is transmitted in the direc...

radio astronomy

(Encyclopedia)radio astronomy, study of celestial bodies by means of the electromagnetic radio frequency waves they emit and absorb naturally. Radio waves also come from outside the Milky Way. These extragalact...

coma, in astronomy

(Encyclopedia)coma, in astronomy: see comet.

Eros, in astronomy

(Encyclopedia)Eros, in astronomy: see asteroid. ...

Hermes, in astronomy

(Encyclopedia)Hermes, in astronomy: see asteroid. ...

Icarus, in astronomy

(Encyclopedia)Icarus, in astronomy: see asteroid. ...

Charon, in astronomy

(Encyclopedia)Charon, in astronomy, the natural satellite, or moon, of Pluto. ...

gamma-ray astronomy

(Encyclopedia)gamma-ray astronomy, study of astronomical objects by analysis of the most energetic electromagnetic radiation they emit. Gamma rays are shorter in wavelength and hence more energetic than X rays (see...

Naiad, in astronomy

(Encyclopedia)Naiad, in astronomy, one of the natural satellites, or moons, of Neptune. ...