Earth in Space Vocabulary

3. ____________ orbit the Sun and are nearly spherical in shape, but they share their orbital paths with other objects of similar size.
6. ___________ occurs when Earth's rotation axis is tilted neither toward nor away from the Sun.
7. _____________ is the spin of an object around its axis.
10. _____________are small, rocky, icy objects that orbit the Sun.
12. ____________ are small. rocky particles that move through space.
14. The orbit of an object around another object is ______________.
15. ___________ are the periodic rise and fall of the oceans' surfaces caused by the gravitational force between Earth and the Moon and the Sun.
17. ___________ is ahuge collection of stars, gas, and dust.
18. __________ are small, rocky objects that orbit the Sun.

1. __________ states that the universe began from one point and has been expanding and cooling ever since.
2. When a meteoroid enters Earth's atmosphere, it produces a streak of light called a _______________.
4. As the lit portion of the Moon becomes larger, the Moon is ____________.
5. ___________ is the distance light travels in one year.
8. ___________ orbits the Sun is massive enough to be nearly spherical in shape and has no other large objects in its orbital path.
9. ___________ is the movement of one solar system object into the shadow of another object.
11. As the lit portion of the Moon becomes smaller, the Moon is _____________.
13. is a natural satellite that orbits an object other than a star.
16. __________ is a large sphere of hydrogen gas hot enough for nuclear reactions to occur in its core.