vocab

2. The layer of gasses surrounding the earth that has gravity strong enough to prevent the gasses from escaping into space.
7. A person who travels in space.
9. way The galaxy that contains our solar system.
10. body an object that is located in outer space.
11. the attractive force of a body. The larger the body the greater the gravitational force.
12. The space that contains all of the matter and energy in existence.

1. The study of everything that is or was in space. Astronomy is the oldest science.
2. A scientist who makes observations and studies planets.
3. A huge collection of stars, Nebulae, star clusters, dust, and gas.
4. year Units used to measure distance in space.
5. a cloud of dust and gas in space in which a star is born.
6. The path followed by an object in space as it moves around another object.
8. The coming together of matter