Hot damn. You don't see this every day.

+Doug Ellison You've got to see this in the unlikely event you haven't already.
Remember that amazing image the Mars Reconnaissance Orbiter snapped of MSL's descent with the parachute fully inflated? Well, if anything beats one spacecraft photographing another in action it's one spacecraft capturing a video of another in action. NASA's GRAIL satellite Flow captured the Lunar Reconnaissance Orbiter around the Moon. It's a little faint and hard to see, but it's super cool!
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