Scientists at MIT have figured out the 45 year old mystery of the moon’s uneven gravitation. An asteroid slammed into the moon, causing a shockwave that sent debris flying. The crust produced a counter wave which increased density in the resulting crater, creating the bullseye gravitational pattern seen today.
The Southern Pinwheel Galaxy or M83 or NGC 5236 - Narrowfield C - May 8, 2016 by Joseph Brimacombe Via Flickr: Taken from Savannah Skies Observatory with an SBIG STL-6303 camera and 33-cm RCOS telescope in a Software Bisque PME mount.
60 x 1 min; Clear Filter; Scale 0.63 asec/px