What is a planet? It is a heavenly body which moves around the sun
on a fixed route. It has no light of its own; you can see it because
it reflects the sun's light. There are nine planet: Mercury, Venus,
Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
Mercury is the planet closest to the sun. Pluto is the furthest
away; it takes 248 years to make one circle of sun!
Four of these planets, Mercury, Venus, Mars and Pluto, are similar
to Earth. They are made of rock and their size is similar to
Earth's. The four other planets are giants compare to our own. These
are: Jupiter, Saturn, Uranus and Neptune. Nowadays, we know about
the laws of gravity. But there are other questions to be answered;
where did our solar system come from? Astronomers carry on their
research with the help of their scientific apparatus. Interestingly,
they have not found a single substance in the solar system which
does not exist on Earth. What does this mean? it means that the sun
and the planets appeared around the same time.
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