Two Soviet spacecraft, the Vostok 5 and 6, returned to Earth, ending a historic joint mission carrying the first woman in space.

Looking for Saturn? On the night of May 22, the planet will be just 2°28’—or the distance of about 2.5 pinky fingers at arm’s length—away from the waning crescent moon.

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Lee Billings is a science journalist specializing in astronomy, physics, planetary science, and spaceflight, and is a senior editor at Scientific American. He is the author of a critically ...