Across
- 2. The 4th planet from the sun
- 4. Traveling through an untamiliar area in order to lear about it
- 5. A bright circle seen around the sun or the moon
- 7. A person who travels in space
- 9. A 2nd planet from the sun
- 10. The Planet closest to the sun
Down
- 1. The line where the earth or sea seems to meet the sky
- 3. The upper layer of the Earth's atmosphere
- 6. The scientific study of stars, planets, and other objects in outer space
- 8. All of space and everything in it including stars, planets, galaxies, elc