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This shipment of 0.5 kilograms (a little over 1 pound) of new heat source plutonium oxide is the largest since the domestic restart of plutonium-238 production over a decade ago.

NASA has officially launched its third Power to Explore Student Challenge.

Three student winners of NASA’s Power to Explore Challenge journeyed behind the scenes at NASA's Glenn Research Center after drafting the top papers in the national STEM essay contest.

NASA’s New Horizons spacecraft plans to observe Uranus and Neptune from its location far out in the outer solar system this fall.

The question of how Saturn developed its brilliant rings is still very much an engaging and open question.

NASA selected three winners out of nine finalists in the second annual Power to Explore Challenge, a national competition for elementary through high school students featuring the power of radioisotopes for space exploration.