The Sun is heavier than the Earth and the pull of its gravity is very strong. It keeps the Earth and the eight other bodies circling in space around the Sun. These bodies are the planets. We can see the five planets with our eyes from Earth - Mercury, Venus, Mars, Jupiter, and Saturn but Uranus, Neptune, and Pluto need to be seen using telescope.
Years ago, many think that the Earth is the center of the solar system and that the moon, sun, and other heavenly bodies revolve around the Earth but, the Polish priest, Nicolaus Copernicus realized what was wrong. The Sun must be the center of everything and not the Earth.
The planets are divided into two groups. The small rocky planets and the giant balls of gas. The small rocky planets include Mercury, Venus, Earth and Mars while the other group includes Jupiter, Saturn, Uranus and Neptune.
The Red Planet. Mars is the fourth planet from the Sun. It is covered by a stony desert.The water and oxygen are locked up in the rusty deposits.
Our galaxy - the Milky Way - is a spiral galaxy with arms extending from the center like a pinwheel. Our solar system is in the Orion arm of the Milky Way. Our Sun is one of about 100 billion stars in the Milky Way. And our galaxy is just one of roughly 100 billion in the visible universe (NASA).
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