Across
- 3. is the next closest planet to the Sun, but is the
- 7. is a remnant of a supernova
- 8. is a huge assemblage of stars, interstellar gas, and dust.
- 9. what remains when a supergiant star collapses into itself
- 10. cools for eons until it is too cold to emit light
Down
- 1. is the closest planet to the Sun
- 2. is the first of the outer planets, beyond Mars
- 4. massive stars
- 5. is the third planet from the Sun
- 6. is the fourth planet from the Sun