Also known as Caldwell 14 or open clusters NGC 869 and NGC 884, ( often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7,500 light years. There
Is a double star designated Beta Cygni (β Cygni, abbreviated Beta Cyg, β Cyg). Beta Cygni is about 415 light-years (127 pc) away from the Sun. When viewed with the naked eye, Albireo appears to be a single star. However, in a telescope it resolves into a double star consisting
Is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598. The Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Milky Way and the Andromeda Galaxy. It is one of the most
Is a cloud of heated and ionized gas and dust in the constellation Cygnus. It constitutes the visible portions of the Cygnus Loop a supernova remnant. The source supernova was a star 20 times more massive than the Sun, and it exploded around 21,000 years ago. The distance estimates of
The Andromeda Galaxy, also known as M31, or NGC 224 and originally the Andromeda Nebula (see below), is a spiral galaxy approximately 2.5 million light-years from Earth, and the nearest major galaxy to the Milky Way. The galaxy’s name stems from the area of the Earth’s sky in which it
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