Across
- 2. combination of atoms.
- 5. 11 times as big as earth in diameter; 121 times in surface. Atmosphere is so dense we can't see the surface. Gravity is 3 times that of Earth. Biggest planet in our solar system.
- 6. cloudlike patches seen in the night sky.
- 7. sheets of carbon with no bond between the sheets to hold them together- very slippery.
- 9. closest to sun. Hot enough to melt lead, no atmosphere to speak of.
- 10. can't prove they are actually here, but if they are, they explain how neutrons, protons, mesons and their relations are formed.
- 12. small and massive, no charge.
- 14. massive but small, positive charge.
- 15. the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields.
Down
- 1. invented by Dirac. Called anti-matter.
- 3. all your genetic make-up in one molecule. It has millions of atoms.
- 4. protons and neutrons creat a ___.
- 8. big and light, negative charge.
- 11. attract protons and create nucleus. The "nuclear glue".
- 13. Earth's only natural satellite.
- 14. Farthest planet we know of.