SPACE.com -- Trick Allows Scrutiny of Pluto's Moon

SPACE.com -- Trick Allows Scrutiny of Pluto's Moon: "Near midnight of July 11, several telescopes in Chile caught a rare and wonderful sight: the shadow of Pluto’s moon, Charon, as it passed in front of -- or occulted -- a distant star.

The observations, now being analyzed, may pin down the size of the moon and whether or not it has an atmosphere. Preliminary indications from one group seem to suggest little or no gaseous envelope."