The solar
system formed around 4.6billion years ago .there are eight planets in the solar
system .the four inner planets are mercury,venus,earth and mars while the four
outer planets are Jupiter ,Saturn,Uranus and Neptune,the inner planets (also
known as terrestrial planets )are smaller and made mostly of rock and metal.
The outer
planets (also known as gas giants) are much larger and made mostly of hydrogen
,helium and other gases.
As of
2008,there are also five dwarf
planets:Pluto,ceres ,eris , makemake and
haumea .there is an asteroid belt which lies between the orbit or mars and
Jupiter,it features a large number of irregular shaped ,asteroids.
4000 of
years humans were unware of the solar
system and believed that earth was at
the center of the universe.
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