... The Last Moon Shot . ... December Moon Meets Evening Star . ... Sometimes mistaken for a tower light near the horizon, Venus is the third brightest celestial beacon, after the Sun and Moon, in planet Earth's sky. ... The Perseus Cluster of thousands of galaxies, 250 million light-years distant, is one of the most massive objects in the Universe and the brightest galaxy cluster in the x-ray sky. ... Many thousands of years ago that star exploded in a supernova leaving the Veil Nebula, pictured above....