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

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-there-are-gravitational-lenses-are-there-gravitational-mirrors https://physics.stackexchange.com/questions/52167/since-ther...