Quiz
1. True or False: Is our solar system the only one in the whole universe?
2. How were the early masses of atoms attracted to each other?
3.What are planets thought to be made from long, long ago?
4.Why are the first planets from the Sun (Mercury, Venus,Earth,Mars) terrestrial planets, and not the other planets?
5.What telescope has helped scientists and astronomers look into nearby galaxies and nebulae?