t WHIRLPOOL OF STARS Lloyd L. Smith Messier 51 in Canes Venatici is an interacting pair of galaxies, with NGC 5195 (top) having recently passed near the large spiral NGC 5194. This interaction has produced the ghostly faint halo of stars extending well beyond the bluish spiral arms seen at left and upper right. DETAILS: RCOS 14½-inch Ritchey-Chrétien telescope with an SBIG STX-16803 CCD camera. Total exposure: 18 hours through LRGB filters. q WINTER HUNT Brian Ventrudo The winter constellations Canis Major and Orion (center) appear to chase Taurus (upper right) above Cathedral Rock near the dark-sky community of Sedona, Arizona. DETAILS: Nikon D750 DSLR camera with Tamron 15-to-30 mm zoom lens at 15 mm, and f2.8. Total exposure: 15-seconds at ISO 3200. 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. Visit skyandtelescope.com/gallery for more of our readers' astrophotos. sk yandtelescope.com * J U N E 2 018 75http://www.skyandtelescope.com/gallery http://www.skyandtelescope.com/aboutsky/guidelines http://www.skyandtelescope.com