The metal mass is hiding under the largest crater in our Solar System, the Moon's South Pole-Aitken Basin (here in dark blue)."Imagine taking a pile of metal five times larger than the Big Island of Hawaii and burying it underground. That's roughly how much unexpected mass we detected," lead author Peter B. James from Baylor University said at the time.The team used data from spacecrafts that make up NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission, which measures subtle changes in the gravitational field of the Moon. These observations can be used to study the internal composition of our natural satellite. As it turns out, the mass they measured is enough to weigh the entire basin floor downward by almost a kilometer (more than half a mile). The crater is roughly 2,500 kilometers (1,550 miles) in diameter, so that's quite the pull.
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