NASA's GRAIL spacecrafts enter Moon's orbit, set to map its gravitational field in March
Way back in September, NASA's Jet Propulsion Laboratory sent a duo of Lockheed Martin-produced spacecraft toward one of its favorite test subjects, the Moon, as a part of its GRAIL mission -- Gravity Recovery And Interior Laboratory. Now, nearly four months later, the administration has announced that the GRAIL-A and -B twin crafts have planted themselves within our Moon's orbit. According to NASA, they're currently in "a near-polar, elliptical orbit with an orbital period of approximately 11.5 hours," and it plans to execute more "
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