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ring, in astronomy

(Encyclopedia) ring, in astronomy, relatively thin band of rocks and dust and ice particles that orbit around a planet in the planet's equatorial plane. All four of the giant planets in the solar…

Pluto, in astronomy

(Encyclopedia) Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying…

The Smaller Satellites

ProteusLarissaDespinaGalateaThalassaNaiadNew Neptunian MoonsNeptune's Rings In addition to the previously known moons, Triton and Nereid, Voyager 2 found 6 satellites in 1989. In 2003,…

The Uranian Rings

Voyager 2 also expanded the body of information pertaining to the rings and moons of Uranus. Voyager's cameras obtained the first images of 9 previously known narrow rings and discovered at…

Astronomical Terms

  The Milky Way, the galaxy containing our solar system, is about 100,000 light-years in diameter and about 10,000 light-years thick.   Aphelion: see Orbit. Apogee: see Orbit. Black hole…

Amy Lowell: A Little Song

A Little SongWhen you, my Dear, are away, away, How wearily goes the creeping day. A year drags after morning, and night Starts another year of candle light. O Pausing Sun and Lingering Moon…