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Across 5. Pheobos and Demos 6. What the Earth lies in 7. Fastest year, slowest day 9. Goddess of love 10. Best planet for the living life 12. Greek messenger God

Down 1. The formation of inner planets 2. Almost the same size as Earth 3. Large lava domes 4. Greek god of war 5. Closest planet to the sun 7. Fourth planet in the Solar System 8. Toxic Atmosphere 10. Made up of 97% of water 11. Brightest object in the sky after the Sun and the Moon