Also the sun was created by scattered  pieces of synthesized gas.  Then  bits of gas and rock amalgamated into the 8 planets. Originally, there was  Pluto  but it was too small(the 1/4 of the moon). Also the orbit was not a direct orbit but an ovate orbit. Other planets in the solar-system include Mercury, Venus, Earth, Mars, Jupiter, Satern, Uranus and Neptune. Mercury's (orbit) year is the shortest from the 8 planets. Its mass is  1/18 of Earth's mass. Its day is 176 Earth days. Its temperature can go to 420~450¡É or  -170¡É~-180¡É. Venus's mass is 0.18 smaller than Earth's, and the core is steel. It's surrounding has acid, and acid rain is strong so it's  totally inhabitable. Earth has a lot of air to breathe and a magnefic field. Mars has iron so it became red. And its atmosphere is 1/100 as Earth's. Jupiter has a great red storm. There are no  friction so a storm is likly not to stop. Saturn's ring is made from bits of rock and ice. It is just 40km thick! Uranus and Neptune are made from methane and ammonia. It's so suprising how the 8 planets are so different even though they are in the same solar-system.

  Next we went to see the dinosaurs. There are a lot of them, and they are mostly carnivore or herbivores. Herbivores protect themselves by horns and carnivores have strong legs, sharp teeth, and strong jaws. There are also omnivores. Omnivores eat meat and grass. We are omnivores too. Then an astroid fell into earth, and all the dinosaurs became extinct. Some scientists say dinosaurs could have been extinct because of an enormous volcano or a terrible disease ,but I believe in the astroid theory.

   I saw and learnded a lot. I want to go to the museum again.

Good job. don't get your "it's" and "its" confused!