Across
- 2. What creates an incredible display of shooting stars every year around mid-July through mid-August? The _______ meteor shower
- 4. Mars atmosphere contains carbon dioxide, nitrogen, _____
- 6. What absorbs ultraviolet radiation to protect us from them?
- 9. There are some _________ that are bigger than Earth's mountains.
- 12. What planet has the biggest mass?
- 13. Any person who has been exposed to sunlight has experienced two forms of the Sun’s energy: ____ and light.
- 14. The closest planet to the earth
- 16. ______ dioxide gas allows heat from the Sun to pass through the atmosphere.
Down
- 1. Cause it is very small and is ________ of miles away
- 3. Closest planet to pluto
- 5. About how many dwarf planets are there beyond the solar system.
- 7. Neptune atmospheres contains hydrogen, helium, _______
- 8. What planet has water but doesn't anymore?
- 10. What are the two areas in which comets reside on the outskirts of the solar system? The Kuiper belt and the ____cloud.Why are Kuiper Belt objects hard to see?
- 11. Scientists think that the atmosphere on Mars used to be ______ than it now is.
- 15. Why were kuiper belts so hard to see Cause they are so _____.