26 January 2019
Moon Struck Image Credit & Copyright: Petr Horálek Explanation: Craters produced by ancient impacts on the airless Moon have long been a familiar sight. But only since the 1990s have observers be
The Umbra of Earth Image Credit & Copyright: Antonio Finazzi Explanation: The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cro
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