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Fresh Crater on Oceanus Procellarum
Fresh and degraded craters in Oceanus Procellarum › View larger image
Fresh and degraded craters in Oceanus Procellarum, near the crater Flamsteed P. Illumination is from left side of the image, incidence angle is 78°, width is 1400 m [NASA/GSFC/Arizona State University].

Today's Featured Image is a great example of typical young and old craters. The crater on the right with lots of boulders spreading out of the cavity is a young, fresh crater. The crater to the left has a smoother surface without recognizable boulders, and has an overall subdued or degraded shape. They are about the same size and both formed in mare basalt. The older example likely had a similar morphology when it formed originally.

Astronomical numbers of small impacts over time are believed to be the main factor breaking boulders into small pieces and smoothing the surface (think of this process as cosmic sand blasting). If you are very patient, visit the crater on the right in about a billion or two years and you will see it looking similar to the degraded crater on the left. Be careful though - when you show up the crater on the left may no longer be around!

Context view of today's Featured Image › View larger image
Context view of today's Featured Image. Blue box indicates the NAC frame, and white arrow points out the location of the two craters. Image center is 2.47° S, 314.26° E. LROC WAC mosaic, 100 m/pixel [NASA/GSFC/Arizona State University].

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