Why do the inner planets lack moons?

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Offline lunar11

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Why do the inner planets lack moons?
« on: 23/10/2009 18:43:00 »
All the planets have Moons in the Solar System except Mercury and Venus (nearest planets to the Sun.
Is there a reason for this or is it just a coincidance?
Thanks

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« Last Edit: 24/10/2009 21:12:20 by chris »

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Offline syhprum

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Re: Why do the inner planets lack moons?
« Reply #1 on: 23/10/2009 19:19:30 »
I think we should also exclude Mars which has two tiny captured satellites.
Earth is a interesting case as it has one very large companion as the result of a collision in its early life.
Basically we can say that none of the four inner planets have any moons dating from the time of their formation.
syhprum

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Offline Vern

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Re: Why do the inner planets lack moons?
« Reply #2 on: 23/10/2009 19:27:15 »
I wonder if it is that the freshly lit sun blew away the lighter dust and gasses that could coalesce into moons.