Across
- 2. An object that orbits a planet or another celestial body that is not a star
- 5. A huge collection of gas, dust, and billions of stars and their solar systems held together by gravity
- 6. An astronomical object with a huge density and gravitational pull, so strong nothing, not even light can escape it
- 7. Rock floating around space. Does not have fiery tails
- 9. The mysterious background energy that scientists say is causing the universe to expand
- 11. Smaller than a planet, orbits the sun, but its not able to clear a path of its orbit
- 12. All matter, including Earth, galaxies, and intergalactic space
Down
- 1. Very old objects that give off large amounts of energy located at the edge of the universe
- 3. A ball of shining gas and plasma, mostly made of Hydrogen and Helium and held together by its own gravity
- 4. An icy rock that lets off gas and dust and may form tails when flying close to the sun
- 8. An invisible form of matter that does not interact with light or other electromagnetic radiation but exerts gravitational force
- 10. Large objects that orbit a star, must be large enough to have gravity to force it into a spherical shape, and must be large enough that its gravity has cleared a path of its own