Across
- 4. A group of stars in the sky.
- 6. A ball of shining gas, made mostly of hydrogen and helium, held together by its own gravity. Turning hydrogen into helium creates the energy that makes stars shine.
- 7. Rocks floating around in space.
- 8. A force that pulls matter together.
- 9. The streak of light caused when a meteoroid enters a planet’s atmosphere and starts to burn from the heat of friction.
- 11. A place in space where matter and light cannot escape if they fall in.
- 12. A cloud of dust or gas found between stars.
Down
- 1. Compact area in the center of a massive galaxy that is around a supermassive black hole. They are some of the brightest objects in the universe.
- 2. The curved path that a planet, satellite, or spacecraft moves as it circles around another object.
- 3. All of space and time, and everything in it. It’s everything ever!
- 4. An icy rock that lets off gas and dust, which may form tails when it is flying close to a sun.
- 5. A collection of thousands to billions of stars held together by gravity. We live in the Milky Way.
- 6. The explosion of a star that makes it as bright as a whole galaxy.
- 9. A natural object that travels around a bigger natural object. The Earth has one we see at night.
- 10. A large body in outer space that circles around the sun or another star.