Astronomy Crossword

2. The time of the solar cycle, during which the solar weather is most active.
4. The process during which the atom's nucleus splits into smaller parts.
6. The oldest type of meteorite, which may be as old as 4.6 billion years old.
9. Among all of the inner terrestrial planets, this one has the densest atmosphere.
12. Only Uranus and Venus have this type of rotation.
14. The edge of the solar system is the ___ Cloud.
15. This belt is similar to the asteroid belt between Mars and Jupiter.
17. The lowest layer of the sun's atmosphere.
19. The escaping dust and gas from the comet.
20. If this type of field is wound together, a sunspot may appear.

1. When the gravity pulling inward is balanced with the pressure that is being pushed out, it is called a gravitational...
3. Another name for the solar prominences.
5. A type of nucleus that has one proton and one neutron.
7. A type of nebula that was created by the Big Bang, which later would fornm the solar system.
8. A scientific name for the "shooting star."
10. Meteorite, whose composition is similar to the Earth's basalt material, belongs to the ___ type.
11. When a thin ring of the sun is visible around the moon's sillhouette, it is a/an ___ eclipse.
13. To determine the mass of an asteroid,the scientists measure its ___ effect.
16. An extremely hot matter that produces ionized gas.
18. Jupiter's clouds appear so bright because of this element.