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Second Order: The Great Craters
Late Heavy Bombardment of the solar system
- Late Heavy Bombardment
- Earth may have been smashed by a Mars-sized object Moon (NASA artist's conception)
- Mars may have been hit obliquely Northern Lowlands
- Mars apparently captured 2 asteroids: Phobos and Deimos
- All inner solar system planets were pummelled
- Earth's geological hyperactivity erased LHB
- Mars is less active and preserves LHB
- Four huge impacts on Mars:
- Argyre
- Hellas
- Isidis
- Utopia