Ganymede, 3,275 mi (5,270 km) in diameter, is Jupiter's largest moon, and it is also the largest satellite in the solar system. Ganymede is about one and one-half times the size of our Moon. It is…
Genesis (U.S.)Galileo (U.S.)Nozomi (“Hope”) (Japan)Stardust (U.S.)Deep Impact (U.S.)Official NASA Page for Past MissionsOngoing MissionsMajor Space ExplorationsFuture Missions
It All Depends on Your PositionTheories of the UniverseCracks in a Newtonian WorldFaster Than a Speeding Light WaveIt All Depends on Your PositionThe Relative Nature of Space and TimeGeological…
Europa, the brightest of Jupiter's satellites, is about 1,950 mi (3,160 km) in diameter or about the size of Earth's Moon. Its density is about three times that of water. The moon is covered…
Amalthea, Jupiter's innermost satellite, was discovered in 1892. It is so small—165 mi (265 km) long and 90 mi (150 km) wide—that it is extremely difficult to observe from Earth. Amalthea…
(Encyclopedia) Van Allen, James Alfred, 1914–2006, American physicist and space scientist, Mt. Pleasant, Iowa. A graduate (Ph.D 1939) of and professor of physics (1951–85) at what is now the Univ. of…
(Encyclopedia) thermometer, instrument for measuring temperature. Galileo and Sanctorius devised thermometers consisting essentially of a bulb with a tubular projection, the open end of which was…
(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…
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