1.What are the basic building blocks of all substances in the universe?

2.What did physicists assume?

3.What did Millikan's experiment tell us about the charge of electrons?

4.What do electrons circling a nucleus form a smaller version of?

5.What were scientists surprised to discover about the atom?

6.What did Rutherford conclude from his experiment?

7.What is the earth?

8.What is the Milky Way?

9.How many other galaxies have been observed?

10.If the sun were the size of an orange, how big would the earth be and how far would it be from the sun?