Space

1. The amount of matter something is made of.
7. Rocks floating around in space. Some are the size of a pick-up truck. Others are hundreds of miles across.
8. The curved path that a planet, satellite, or spacecraft moves as it circles around another object.
12. Bright glows and bands of light that appear in the skies at night near the North Pole. They are also called the northern lights.
13. The stuff that everything is made of. Atoms are a tiny bit of matter. Big planets have lots of matter.
14. All of space and time, and everything in it. It’s everything ever.
17. The circle around a planet or moon that is the same distance from its north pole and its south pole.
18. The outer atmosphere of a star.
19. A place in space where matter and light cannot escape if they fall in.

2. A vehicle used for traveling in space.
3. A force that pulls matter together.
4. The gases held by gravity around Earth and around other planets. "Atmosphere" can also be used to talk about gases around stars.
5. A cloud of dust or gas found between stars.
6. The universe seen as an orderly, harmonious whole.
9. A large body in outer space that circles around the sun or another star.
10. An icy rock that lets off gas and dust, which may form tails when it is flying close to a sun.
11. A collection of thousands to billions of stars held together by gravity. The galaxy we live in is called the Milky Way.
15. The explosion of a star that makes it as bright as a whole galaxy.
16. Lands on the surface of a planet.