Space Unit Review

2. When the Earth blocks out the sun and casts a shadow on the Moon.
4. The basic element that makes up all stars.
7. Pluto is an example.
9. The space-telescope that has discovered hundreds of planets outside our solar system.
11. Earth has a northern one and a southern one.
12. when the earth, sun and moon form a straight line, and produce extreme high and low tides.
15. Where stars are "born".
17. The unit we use to measure distances between stars.
18. The most common type of star in the universe.
20. The unit we use to measure distances in the solar system.
21. The curved path an object takes around a planet or star.

1. A small space rock that has fallen to Earth.
3. When the moon blocks out the sun and casts a shadow on the Earth.
5. Created by the collapse of very big stars; a point of infinite gravity/density.
6. The tilt of the earth produces these.
8. The small, hot, dense "skeleton" of a star.
10. the type of wave energy we use to communicate in space.
13. The force that pulls objects with mass together.
14. The large type of star our Sun will turn into when it reaches the end of its life.
16. The planet with the most moons in the solar system.
19. A powerful burst of energy from the Sun.