GALLERY X CARINA CLUSTER Kfir Simon Dense, reddish dust lanes weave around the bright, young stars of the open cluster NGC 3293 in Carina, the Keel. The gas and dust behind those stars reflect their light, creating the brilliant blue color at the center of this image. DETAILS: 16-inch f/3.75 Dream Astrograph with Apogee Alta U16M CCD camera. Total exposure: 5½ hours through Hα and LRGB filters. T SUNRISE ON THE SEA OF MOISTURE Steve Thornton Despite its name and the ridges that appear to ripple across its surface (center right), Mare Humorum is not wet. A thick layer of dark basalt fills this ancient crater. Later impacts created Gassendi Crater and its partner Gassendi A, which sit on the mare's northern edge. DETAILS: Celestron C9.25 Schmidt-Cassegrain telescope with ZWO ASI290MM video camera. Stack of about 1,200 frames. 74 J U LY 2 0 2 1 * S K Y & T E L E S C O P E