J. Kelly Beatty Gallery Gallery showcases the finest astronomical images submitted to us by our readers. Send your best shots to gallery@SkyandTelescope.com. See SkyandTelescope.com/aboutsky/guidelines. ▴ JELLYFISH ENCOUNTER Gregg Ruppel The 3rd-magnitude star Mu Geminorum - known as Tejat Posterior (Castor's "back foot") - marks the way to the dim emission nebula Sharpless 2-249 and, at far right, the brighter Jellyfish Nebula (Sh2-248, part of supernova remnant IC 443). Details: ASA 10N astrograph and SBIG STL-11000M CCD camera with Astrodon GenII filters. Total exposure: 11 hours. ▶ TRIPLE TREAT ON JUPITER Efrain Morales January 23, 2015, offered a rare event: the Galilean satellites Io (I), Europa (E), and Callisto (C) all cast their shadows on Jupiter's disk simultaneously for an all-too-brief 24 minutes. Details: Meade LX200ACF 12-inch telescope, Point Grey Research Flea3 CCD camera, and Astronomik filters. 76 June 2015 sky & telescope C E Ihttp://www.SkyandTelescope.com/aboutsky/guidelines