Jupiter contains 2/3 of the planetary mass of the solar
system. Its interior pressure may reach 00 million times the
surface pressure on earth. It has 16 moons, a ring system
and an immense, complex atmosphere.
Jupiter's distance from the sun is 778.3 million
kilometers. Its period of revolution is 11.86 earth years or 1
Jovian year. The equatorial diameter is 143,200 kilometers.
Jupiter's atmosphere's main components are hydrogen and
The names of the 16 moons on Jupiter are Metis,
Adrastea, Amalthea, Thebe, Io, Europa, Ganymede, Callista,
Leda, Himalia, Lysithea, Elara, Ananke, Carme, Pasiphae
and Sinope. There is one ring around Jupiter which is
composed of 3 bands which are dark and made of impact
Galileo discovered 4 of Jupiter's moons in 1610. The
Pioneer 10 took cloudtops and moon images from 130,354
kilometers aaway in 1973. Pioneer 11 passed within 43,000
kilometers of Jupiter and took the first images of the polar
regions in 1974. The Voyager 1 passed within 350,000
kilometers and discovered a faint ring and 3 more moons in
1979. In the same year, Voyager 2 passed within 650,000
kilometers and provided detailed imagery of the Jovian ring
and Io volcanism. In 1989,Galileo spacecraft launched to
arrive in Jupiter in 1995.