Across
- 3. year the distance light travels within a year
- 7. planets,asteroids, and comets all orbiting the sun held by gravity
- 8. a substance containing mass and volume taking up space
- 10. a person who studies planets and outer space with a telescope
- 11. a massive system made up of stars, gas, and dust
- 12. a fact or thing that is unusual
- 13. the dark shape or shadow of someone or something in light
Down
- 1. an invisible force that pulls us down to earth
- 2. an expert of physics
- 4. hot flowing matter that is made up of charged particles
- 5. the boundary of a black hole in which objects get trapped in and don't return
- 6. hole a force that attracts and traps objects like light
- 9. light that vibrates in one direction only