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Clues
Across
4. First astronomer to search for Planet X
5. Planet discovered in 1930 later named Pluto
6. The planet that we live on
8. Machine designed to explore outer space
9. A small point of light in the sky
14. All of the air surrounding Earth
16. First American to orbit the Earth
17. The planet in our solar system furthest from the Sun
18. The path of a planet around the sun
19. Used to study the stars
20. To look for something
Down
1. The sun, planets, asteroids, and comets
2. The science of rockets
3. Person trained to make rocket flights into outer space
6. A test to find out something
7. Finding out something for the first time
10. To turn around or spin
11. Food that is vacuum packed to keep for a long time
12. The satellite that orbits the Earth monthly
13. An expert in the stars and planets
15. A distant land for new settlement
