Across
- 4. an area in space where nothing can escape
- 5. The study of the starts
- 8. forms of life on other planets
- 12. a substance that humans can breathe safely
- 14. a planet outside the solar system that might sustain life
- 15. The speed that light travels at
Down
- 1. a hole that can go faster than the speed of light
- 2. A planetary system with a sun/star in it
- 3. Theory of space time
- 6. a massive object that lets humans go to space
- 7. a void with nothing in it
- 9. a bright hot star
- 10. a smaller planet that orbits another planet
- 11. A substance with the subname H2o
- 13. a force that attracts stars, planets(etc) to eachother