Across
- 2. object made of rock or metal that orbits the sun
- 3. a space object with surface gravity great enough that light can't escape it
- 6. a force that exists between any 2 objects
- 7. the theory of the universe
- 10. planets controlled by the sun's gravity
- 12. the path a planet takes around the sun
- 14. a telescope orbiting the earth
- 17. a picture in an area of the sky
Down
- 1. the length of a straight line
- 4. it's made up of galaxies
- 5. the distance that light travels in one year
- 8. a group of solar systems
- 9. a body of ice and dust that travels in a long narrow orbit around the sun
- 11. our galaxy
- 13. a big ball of glowing gas
- 15. a large circular mass that revolves around a star
- 16. everything is made of it