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Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by soheil on Monday February 08, 2021 @10:02PM (#26073367)
I think you answered 2 first. Someone mentioned this link so I just wanted to post it again [0].

Regarding the first question why can't there be a planet let's say in Andromeda with a lake that would reflect back the light from our galaxy? That's only 2.5 million lightyears x 2.

[0] https://physics.stackexchange.com/questions/52167/since-ther...

Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by labawi on Monday February 08, 2021 @10:27PM (#26073490)
Didn't do the calculation, but I don't think you would get any meaningful light back.
Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by kstrauser on Monday February 08, 2021 @10:20PM (#26073448)
Oh, oops. I somehow managed to completely misread that question.