Seriously great timing

I was very, very impressed when the Mars Reconnaissance Orbiter got a shot of the Mars Curiosity rover on its parachute as it descended (successfully, despite my misgivings) to the surface of Mars.  But it was moving relatively slowly.

But it's even more impressive when a satellite in orbit around the Moon gets a picture of another satellite in orbit around the Moon passing under it in a lower orbit.   Because the satellite in orbit is moving pretty darned fast.

But that's exactly what happened.  Now, I'm just providing the link there, because you have to go to full size on the image to see the little blur of the LADEE satellite under the Lunar Reconnaissance Orbiter satellite.  But it is there.   Another impressive demonstration of imaging technology.