In the 19th century, passenger pigeons were so numerous that hunters competed to shoot as many as possible. But the last passenger pigeon died in the Cincinnati Zoo over 100 years ago. How did it all go so wrong?
Robert Pettengill of Austin, Texas caught the moon on the last evening of fall - December 20, 2017 - from Austin, Texas. The pale glow on the darkened portion of the crescent is called earthshine.
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