About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 148. Not illustrated. Chapters: Andromeda Galaxy, Messier 32, He0450-2958, Ngc 147, Ngc 185, Holmberg Ix, Messier 110, Ngc 247, 3c 244.1, Einstein Cross, Dwingeloo 1, 3c 236, Circinus Galaxy, Eso 306-17, Eso 269-57, Ugc 9561, Mcg+04-35-019, Ngc 5820, Ngc 5821, Ngc 5665, Ic 982, Qso J0842+1835, Ic 983, Ngc 6263, Mcg+02-38-020, 3c 83.1b, Ngc 1134, Ugc 11066, Arp 64, 3c 401, Ngc 250, Ic 1838, 3c 61.1, 3c 288, 3c 285, Ic 195, Ngc 145, 3c 171, 3c 20, 3c 249.1, Ic 167, 3c 215, 3c 438, 3c 35, 3c 153, 3c 109, Ugc 2320, 3c 305, 3c 47, Ugc 1432, Mcg+04-35-016, 3c 9, 3c 191, Ic 496, Leda 70742. Excerpt: The Andromeda Galaxy is a spiral galaxy approximately 2,500,000 light-years (1.58 AU) away in the constellation Andromeda. It is also known as Messier 31, M31, or NGC 224, and is often referred to as the Great Andromeda Nebula in older texts. Andromeda is the nearest spiral galaxy to our own, the Milky Way. As it is visible as a faint smudge on a moonless night, it is one of the farthest objects visible to the naked eye, and can be seen even from urban areas with binoculars. It gets its name from the area of the sky in which it appears, the Andromeda constellation, which was named after the mythological princess Andromeda. Andromeda is the largest galaxy of the Local Group, which consists of the Andromeda Galaxy, the Milky Way Galaxy, the Triangulum Galaxy, and about 30 other smaller galaxies. Although the largest, Andromeda may not be the most massive, as recent findings suggest that the Milky Way contains more dark matter and may be the most massive in the grouping. The 2006 observations by the Spitzer Space Telescope revealed that M31 contains one trillion (10) stars, more than the number of stars in our own galaxy, which is estimated to be c. 200-400 billion. While the 2006 estimates put the mass of the Milky Way to be 80% of the mass o...
