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