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Basic Planetary Data
Mercury Venus Earth MarsJupiterMean distance from Sun (millions of kilometers) 57.9 108.2 149.6 227.9 778.3Mean distance from Sun (millions of miles) 36.0 67.24 92.9 141.71 483.88Period of…The First Ten Asteroids Discovered<sup class="fnr" >1</sup>
Between the orbits of Mars and Jupiter are an estimated 30,000 pieces of rocky debris, known collectively as the asteroids, or planetoids. The first and largest, Ceres, was discovered Jan. 1…Brewer's: Pluto
The grave, or the god of that region where the dead go to before they are admitted into Elysium or sent to Tartaros. “Brothers, be of good cheer, this night we shall sup with Pluto.” —…Phenomena, 2007
Configurations of Sun, Moon, and Planets January February March…After 20 Years, Barbra Morgan Becomes First Teacher in Space
Teacher/Astronaut was backup to Christa McAuliffe by Mark Zurlo Related Links Space Shuttle TimelineSpace Shuttle (Encyclopedia) Space AccidentsSpace MoviesSpace ExplorationIn 1985…Comet Hale-Bopp
THE GREAT COMET OF 1997. Above, the bright head of comet Hale-Bopp, called the coma, is pointed towards the Sun. The coma is composed of dust and gas, masking the solid nucleus of the comet…Triton
The largest of Neptune's 13 known satellites, Triton was discovered in 1846 by British astronomer William Lassell. Triton circles Neptune in a tilted, circular, retrograde orbit, completing an orbit…The Flap Over Pluto
Sources: NASA and the International Astronomical Union. News Flash (August 24, 2006)—Pluto Demoted! Read About It Here. Misleading reports that Pluto was about to lose its status as a planet…New Uranian Moons Discovered
In Sept. 1999, Cornell University astronomers announced the discovery of three more satellites. The moons have been named Setebos, Stephano, and Prospero. The satellites are about 12 mi (20…A Richter Scale for Close Encounter Asteroids
Sources: NASA and Massachusetts Institute of Technology. A new tool to help scientists, the media, and the public assess the potential danger of asteroids and comets, collectively called near…Trending
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