Across
- 5. The streak of light caused when a meteoroid enters a planet’s atmosphere
- 7. The smallest unit of a substance that still acts like the main substance
- 9. A cloud of dust or gas found between stars
- 10. Large natural objects that orbit, or travel around stars
- 13. a huge collection of gas, dust, and billions of stars
- 14. all of space and matter of energy
- 16. The basic building block of matter
- 17. The stuff that everything is made of
Down
- 1. a place in space where gravity pulls so much that even light can not get out
- 2. A group of stars in the sky
- 3. small, rocky objects that orbit the Sun
- 4. An icy rock that lets off gas and dust
- 6. A force that pulls matter together
- 8. The explosion of a star that makes it as bright as a whole galaxy.
- 11. A large, bowl-shaped dent in the ground
- 12. An empty space that doesn't have any matter.
- 15. giant balls of hot gas