Space

3. The circle around a planet or moon that is the same distance from its north pole and its South Pole
8. The amount of matter something is made of.
9. the planet furthest from the sun
13. a person who is trained to travel in a spacecraft.
15. layer A part of Earth’s atmosphere that absorbs lots of the sun’s ultraviolet radiation
17. the most famous dwarf planet
18. a tiny piece of something
19. A cloud of dust or gas found between stars.
20. The stuff that everything is made of

1. A large body in outer space that circles around the sun or another star.
2. A force that pulls matter together
4. A natural object that travels around a bigger natural object.
5. A loose collection of atoms moving around each other.
6. the star our solar system revolves around
7. the planet we live on
10. A planet that freely floats between stars or one that orbits a star outside our solar system
11. A donut-shaped ring of icy objects beyond the orbit of Neptune
12. A large, bowl-shaped dent in the ground
14. the curved path of a celestial object or spacecraft round a star, planet, or moon, especially a periodic elliptical revolution
16. a huge collection of gas, dust, and billions of stars