How bright is Earth when viewed from another planet?
honestly it really depends on which planet you are standing on. if you were on mars earth would look like a very bright blue star in the sky much like how venus looks to us here. it would actually be one of the brightest objects in the night sky. when earth is at its closest point to mars it gets pretty intensely bright because of all the water and clouds reflecting sunlight. clouds are actually amazing reflectors so they make our planet pop against the blackness of space. if you were further out like on saturn it would just be a tiny pale blue dot almost lost in the glare of the sun. distance is the biggest factor here but generally speaking earth is quite reflective compared to say the moon or mercury because of our atmosphere and oceans.
from mars it is a double star. since the moon is so large and close to us someone looking at us from mars would see two bright points of light traveling together. earth would be the brighter blue one and the moon would be a smaller fainter white one. they would be easily visible to the naked eye just after sunset or before sunrise. its cool to think that other hypothetical astronomers would see us as a binary system.
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