Today’s Factismal: Alpha Centauri is 25,800,000,000,000 miles away. Have you ever wondered how we know how far away the stars are? You aren’t alone. Indeed, until 1839, everyone more or less assumed that the answer was “really far”. The reason for that is that stars don’t display parallax and don’t occult; that is, the nearer […]Image may be NSFW.
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