Astronomy vocab

1. Studies elements,atoms, and molecules to explain the chemical composition of objects in outer space
3. The partial or total blocking of one object by another
4. The attractive force between two objects; the amount of force depends on their masses and the distance between them
5. A pattern of stars in the sky
9. Occurs whenever the moon passes behind Earth In the relation to the sun
12. The study of the moon,stars and other objects in space
13. A round pit on the moons surface
14. An imaginary line that passes through Earths center and the North and South poles, about which Earth rotates

1. small; an eccentrically orbiting body made of rock and ice which have one or more tails that point away from the sun
2. A meteoroid that has hit the Earth's surface
6. A celestial body of hot gasses that radiates energy derived from thermonuclear reactions in the interior
7. An object in space whose gravity is so strong not even light can escape
8. The distance that light travels in one year
10. A natural object that orbits a planet
11. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction