<P> Simon Marius had independently discovered the moons one day after Galileo, although he did not publish his book on the subject until 1614 . Even so, the names Marius assigned are used today: Ganymede; Callisto; Io; and Europa . No additional satellites were discovered until E.E. Barnard observed Amalthea in 1892 . </P> <P> With the aid of telescopic photography, further discoveries followed quickly over the course of the 20th century . Himalia was discovered in 1904, Elara in 1905, Pasiphae in 1908, Sinope in 1914, Lysithea and Carme in 1938, Ananke in 1951, and Leda in 1974 . </P> <P> By the time that the Voyager space probes reached Jupiter, around 1979, 13 moons had been discovered, not including Themisto, which had been observed in 1975, but was lost until 2000 due to insufficient initial observation data . The Voyager spacecraft discovered an additional three inner moons in 1979: Metis; Adrastea; and Thebe . </P> <P> No additional moons were discovered for two decades, generally during the 1980s and 1990s, but between October 1999 and February 2003, researchers found another 34 moons using sensitive ground - based detectors . These are tiny moons, in long, eccentric, generally retrograde orbits, and averaging 3 km (1.9 mi) in diameter, with the largest being just 9 km (5.6 mi) across . All of these moons are thought to have been captured asteroidal or perhaps comet bodies, possibly fragmented into several pieces . </P>

One of the inner moons of jupiter discovered in 1979
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