GALLERY p BIG DOMES p A BRIEF MOMENT IN TIME Howard Eskildsen Volcanic domes Mons Gruithuisen Gamma (middle left) and Delta (middle right) stand high above the lunar landscape south of Mairan crater (upper middle). DETAILS: 6-inch f/8 Explore Scientific refractor with Imaging Source DMK 41AU02.AS video camera. Stack of several hundred video frames recorded through a yellow filter. Dario Giannobile Lenticular clouds rise above the active volcano Mount Etna in Sicily. Hot lava casts a reddish glow on the underside of the clouds, which block most of the light from the old crescent Moon. A bright meteor flashes to the left. DETAILS: Canon EOS 6D with 20-mm lens at f/2. Total exposure: 13 seconds at ISO 3200. STELL AR PERSPECTIVES Gregg Ruppel Residing about 550 light-years from Earth, Antares (left) is practically next door compared to globular cluster M4 (right, roughly 7,000 l-y) and NGC 6144 (top, nearly 28,000 l-y). DETAILS: Astrosysteme Austria ASA 10N astrograph with SBIG STL11000M CCD camera. Total exposure: 8.2 hours through LRGB filters. 76 D EC E M B E R 2 019 * SK Y & TELESCOPE