Across
- 2. galaxeys will drift so far apart they can nebr touch again
- 5. the world will suck itsef into a blackhole becuase of gravity
- 7. a theory of how too much heat wil slowly swallow earth
- 9. the universe will colaspe into itself
- 12. a small bright heavenly body that develops a cloudy tail as it moves in an orbit around the sun
Down
- 1. one of thousands of rocky object
- 2. a whole that sucks up all of the objects
- 3. a theory in astronomy: the universe originated billions of years ago in a rapid expansion from a single point of nearly infinite energy density
- 4. a unit of length in astronomy equal to the distance that light travels
- 6. universe will eventually become ifanite
- 8. a collection of star systems
- 10. everything that exists anywhere
- 11. the universe considered as a whole
- 13. one of the small pieces of matter in the solar system that enter the earth's atmosphere where friction may cause them to glow and form a streak of light