... GLOBE at Night: Help Track Light Pollution . ... Specifically, people are invited to go out an hour after sunset and look for the constellation Orion toward the west. ... Martian Moon Deimos from MRO . ... Pictured above, in a recently release image by HiRISE camera onboard the Mars-orbiting Mars Reconnaissance Orbiter (MRO), is Deimos, the smaller moon of Mars. Deimos is one of the smallest known moons in the Solar System measuring only about 15 kilometers across. ... Hickson Compact Group 90 . ...