Thursday, October 13, 2016

Watching for new craters

Seems the Moon still gets hit by meteors quite often:

Meteorites have punched at least 222 impact craters into the Moon's surface in the past 7 years. That’s 33% more than researchers expected, and suggests that future lunar astronauts may need to hunker down against incoming space rocks....
Although most of the craters dotting the Moon's surface formed millions of years ago, space rocks and debris continue to create fresh pockmarks. In 2011, a team led by Ingrid Daubar of NASA’s Jet Propulsion Laboratory in Pasadena, California, compared some of the first pictures taken by NASA’s Lunar Reconnaissance Orbiter (LRO), which launched in 2009, with decades-old images taken by the Apollo astronauts. The scientists spotted five fresh impact craters in the LRO images. Then, on two separate occasions in 2013, other astronomers using telescopes on Earth spotted bright flashes on the Moon; LRO later flew over those locations and photographed the freshly formed craters2, 3.

LRO has taken about a million high-resolution images of the lunar surface, but only a fraction cover the same portion of terrain under the same lighting conditions at two different times. Speyerer’s team used a computer program to automatically analyse 14,092 of these paired images, looking for changes between the two. The 222 newfound craters are distributed randomly across the lunar surface, and range between 2 and 43 metres in diameter.

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