So this is how the war in space might begin: not with a bang but a clank. On April 15, more than 450 miles above Earth, an experimental NASA spacecraft called DART (Demonstration of Autonomous Rendezvous Technology) fired its thrusters and closed in on a deactivated U.S. military communications satelliteand then gently bumped into it.

This is the first photograph taken by a microsatellite of another object in space that has ever been released to the general public. The object near the center is the upper stage of a Minotaur I rocket that was used to launch the Experimental Satellite System-11, commonly known as XSS-11. The photograph was taken by the digital "witness camera" aboard XSS-11, a dishwasher-size microsatellite developed by the Air Force Research Laboratory.