Twin craters on Halex and Margaritifer Sinus, Mars

This images shows two pairs of twin craters which are similar in diameters and nearly identical in structure. The line between indicates that were formed by a binary impact. One explanation is that they were probably formed when a binary asteroid pair (a system of two asteroids orbiting their common barycenter) struck the surface. The asteroids must have been about the same size, on the order of a few hundred meters across, to produce these craters.

OIO1: 41°33'42.73"N 100°52'22.20"W (Halex)
OIO2: 0°37'32.48"S 20°57'33.01"W (Margaritifer Sinus)
other: 38°11'39.01"N 172°31'15.12"E, 11°11'9.80"N 97°35'25.32"W,  30°11'35.75"N  13°43'5.20"W
       
http://www.space.com/9007-secret-twin-asteroid-birth-revealed.html

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All thanks go to NASA/JPL/Malin Space Science Systems. for providing the images used in this video.

http://www.nasa.gov/

http://www.jpl.nasa.gov/

http://www.msss.com/