... At the center of our Milky Way Galaxy, a mere 27,000 light-years away, lies a black hole with 4 million times the mass of the Sun. Fondly known as Sagittarius A* (pronounced A-star).. ... The suggestively shaped reflection nebula is associated with the bright star Rigel in the constellation Orion. ... Planetary Nebula PK 164 31 . ... Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. ... NGC 206 and the Star Clouds of Andromeda . ...