Space

4. Our universe is currently doing this.
6. giant, dusty snowballs.
8. Astronomer who first discovered universe was expanding.
11. NASA's main topic of interest.
13. This type if eclipse occurs when the moon lines up between the earth and sun.
14. Astronomers study these types of objects.
16. When more than half a moon is visible.
17. This is evidence to support the Big Bang theory.
19. This season occurs in Ireland when the Europe is tilted towards the sun.
20. When the moon appears to be getting smaller.

1. Large rocky bodies.
2. This type of eclipse occurs when the sun lines up between the earth and moon.
3. Region where many comets are located
5. Pluto is not one of these.
7. The name of our galaxy.
9. A collection of galaxies.
10. When the moon appears to be getting bigger.
12. When the sun, and earth align.
15. Occurs in Australia when Ireland is tilted towards the sun.
17. When less than half a moon is visible.
18. A collection of planetary systems.