Why does the sky appear black to an astronaut?
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The sky appears black to astronauts because there is no atmosphere in space to scatter sunlight. Without atmospheric particles to diffuse light, the sky lacks color and appears black, allowing stars and celestial bodies to be seen clearly against the dark background.
To an astronaut, the sky looks dark and black instead of blue because there is no atmosphere containing air in the outer space to scatter sunlight. So, there is no scattered light to reach our eyes in outer space, therefore the sky looks dark and black there.