It consists of the sun and the nine planets that revolve around the sun.
It also includes moons, asteroids, etc. The nine
planets are Mercury, Mars, Venus, Earth, Saturn, Jupiter,
Uranus, Neptune, and Pluto. There is research to
determine if any of them had life besides the planet Earth,
but it appears that only Mars could have the possibility of
sustaining life at some point millions of years ago.
The moons are also important. While the Earth has only
one moon that revolves around it, the other planets have
many moons. The largest planet of them all is Jupiter,
followed by Saturn, Uranus, Neptune, and the Earth.
There has been the discovery of a 10th planet, but it has
yet to be named.