An artist's illustration of events on the sun changing the conditions in near-Earth space. NASA hide caption

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There's plenty of starfield action going on in Prometheus. Twentieth Century Fox hide caption

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Gary Hug built what he calls the Sandlot Observatory, with its 22-inch reflector telescope, behind his house near Topeka, Kan. Courtesy of Gary Hug hide caption

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This artist's illustration shows what NuSTAR should look like in orbit after its 30-foot-long mast deployed. JPL-Caltech/NASA hide caption

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Astronauts Shannon Walker and David Saint-Jacques test a probe in the waters off Key Largo, Fla. Their research may help NASA set foot on an asteroid someday. Miami Herald/MCT via Getty Images hide caption

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