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Alpha Centauri

(Encyclopedia)Alpha Centauri ălˈfə sĕntôrˈē [key], brightest star in the constellation Centaurus and 3d-brightest star in the sky; also known as Rigil Kent or Rigil Kentaurus; 1992 position R.A. 14h39.1m, De...

observatory

(Encyclopedia)observatory, scientific facility especially equipped to detect and record naturally occurring scientific phenomena. Although geological and meteorological observatories exist, the term is generally ap...

apsis

(Encyclopedia)CE5 Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun. apsis (pl. apsides), point in the orbit of a body whe...

Ultima Thule

(Encyclopedia)Ultima Thule, in astronomy and space exploration, nickname for Arrokoth. ...

radar

(Encyclopedia)radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, ...

Dysnomia

(Encyclopedia)Dysnomia, in astronomy, the moon, or natural satellite, of Eris. ...

Miranda

(Encyclopedia)Miranda, in astronomy, one of the moons, or natural satellites, of Uranus. ...

Juliet

(Encyclopedia)Juliet, in astronomy, one of the natural satellites, or moons, of Uranus. ...

Desdemona

(Encyclopedia)Desdemona, in astronomy, one of the natural satellites, or moons, of Uranus. ...

Despina

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