GALLERY t TURNING BLUE Dan Llewellyn After almost seven years of chilly winter under the shade of the planet's rings, heavy aerosols in the upper atmosphere of Saturn's southern hemisphere sunk, leaving behind lighter molecules that scatter blue light, turning the region blue. Two of Saturn's moons, Tethys (right) and Rhea (far right), circle just beyond its rings. DETAILS: Celestron C14 Schmidt-Cassegrain and Player One Mars-C II (IMX662) camera. Stack of 11,000 frames. q FLASHING EQUINOX Chirag Upreti As the Sun rose above the trees in New York City on the day of the 2023 vernal equinox, strong differential refraction in the atmosphere produced a rare morning green flash. DETAILS: Sony α7R III camera and 150-to-600-mm lens. Total exposure: 1/4,000 second at f/18, ISO 64. Gallery showcases the finest astronomical images that our readers submit to us. Send your best shots to gallery@skyandtelescope.org. See skyandtelescope.org/aboutsky/guidelines. Visit skyandtelescope.org/gallery for more of our readers' astrophotos. 78 NOVEMBER 2023 * SKY & TELESCOPEhttp://www.skyandtelescope.org/aboutsky/guidelines http://www.skyandtelescope.org/gallery