Across
- 3. commonly known as Earth's "sister" planet and has a thick atmosphere consisting of carbon dioxide
- 5. surrounding air on a planet
- 6. commonly referred to as the "Red Planet", has the longest orbit of the inner planets
- 7. move repeatedly around
- 8. similar to Earth
Down
- 1. the first 4 planets in the Solar System: Mercury, Venus, Earth, Mars
- 2. a celestial object that orbits around a planet
- 4. our home planet, takes 365.25 days to complete an orbit, biggest inner planet
- 6. the closest planet to the Sun, the smallest planet, and has the shortest orbit