9 months ago
Last edited at 8:31AM on 6/22/2013
Jupiter is made primarily of hydrogen and helium. Jupiter, Saturn, Uranus and Neptune did not form the same way as the first 4 planets. Hydrogen and helium were abundant beyond the "frost line," the region beyond Mars where temperatures were cool enough to condense these gases into ices. The ices pulled themselves together through gravity to create the cores of the giant planets. As the cores got bigger, so did their gravity. They pulled in more and more hydrogen and helium (as well as methane and ammonia in Uranus and Neptune's cases), which created the gaseous "surface" of the gas giants we see today.
Jupiter is a giant gas planet. Meteors are remnants of planets that enter our atmosphere, meteorites are the same but they actually land. Asteroids are meteors that are giant also called "minor planets".