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