Unformatted text preview: lverized layer of impact
ejecta… mineral dust, beads of impact glass Formation of the Moon ! Earth has a large iron-nickel core, but the moon does not
Moon is far less dense than Earth, due to the lack of a significant core
Oxygen isotopic composition of the Earth and moon are identical, where
other terrestrial planets have differing O isotopic signatures (moon formed in
No other terrestrial planet (in our system) has such a large satellite ! Impact Hypothesis !
! • Moon is the result of a glancing impact from a Mars-sized object, early in the
history of the solar system Terrestrial Planets: Mars
Mars ! Orbit:
Density: ! Thin atmosphere !
! Evidence of abundant volcanism in recent geologic past
Unclear but compelling evidence of surface liquid water in distant past
• Some evidence of liquid water seepage from interior in recent past
• Most water lost early in history, due to gravitational loss from atmosphere Geologically de...
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- Spring '14
- Solar System, Planet, liquid water, terrestrial planets