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Old 01-07-2017, 09:25 AM
Darren Garrison Darren Garrison is offline
Join Date: Oct 2016
Posts: 6,469
Originally Posted by Chronos View Post
Earth from Mars will be brighter than Mars from Earth, for three reasons: First, Earth is closer to the Sun, and so gets more sunlight to reflect. Second, Earth has a much higher albedo, mostly due to clouds. Third, Earth is bigger. The net effect wouldn't be quite as bright as Venus is from Earth, but it'd still be plenty impressive. Especially since Earth would always be accompanied by another decently-bright point of light, Luna.
Is this taking into account the fact that, being further than the sun from us, we always see a "full Mars", but Earth, being closer to the sun than Mars, is only a "full Earth" when it is on the opposite side of the sun from Mars, and only in partial phase (or entirely dark) when closer to Mars?