Across
- 4. something lots smaller than atom.
- 5. closest planet to the sun.
- 6. something can can never be prove___________?
- 8. science consist of Scientific theory and ____________?
- 10. a heavy electron.
- 13. a group of millions to billions of stars help together by mutual gravity.
- 14. system consist of things that go around a Star.
- 15. neutron and ______ are help together by mesons?
- 16. a generic name for electrons and their relatives.
- 18. dark matter, star, and what make up a galaxies.
- 19. Quarks are held together by what?
Down
- 1. a big things that went around a sun and moons were anything that went around.
- 2. what is the opposite charge of a proton?
- 3. result from a runaway thermonuclear reaction.
- 7. it was invented to Save the conservation of energy.
- 9. rocks going around space.
- 11. My teacher calls himself.
- 12. a no longer consider planet.
- 17. hole a star that crush with great gravity.
- 20. Cloud comets froze a huge spherical cloud far outside of the Kuiper belt.