Across
- 3. How many days is a year in Mercury have in Earth days?
- 5. Which planet is the smallest terrestrial planet?
- 7. What is Venus' atmosphere mostly made out of?
- 10. What was the first probe that visited Venus?
Down
- 1. What is the force that attracts a body toward the center of the earth, or toward any other physical body having mass?
- 2. What type of planets are Earth-like planets made up of rocks or metals with a hard surface?
- 4. What planet has no moons?
- 6. How many inner planets are there?
- 8. What is Earths atmosphere made out of?
- 9. Is Mars an inner planet?