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An asteroid itself does not emit light, like a comet. It can only reflect light like the moon. The moon only looks bright because it reflects light from the sun. So when you think about it, an asteroid, like the one that passed the earth back in NOV 2011, was only the size of an aircraft carrier which is negligible compared to the moon. The moon doesn't seem bright compared to the sun, and so an asteroid wouldn't seem bright compared to the moon. You can't actually see an asteroid with the naked eye; it would take a telescope.

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13y ago

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