Large Magellanic Cloud - Dark Matter (Paperback)

Chapters: Dark Matter. Source: Wikipedia. Pages: 66. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: The Large Magellanic Cloud (LMC) is a nearby irregular galaxy, and is a satellite of the Milky Way. At a distance of slightly less than 50 kiloparsecs (160,000 light-years), the LMC is the third closest galaxy to the Milky Way, with the Sagittarius Dwarf Spheroidal ( 16 kiloparsecs) and Canis Major Dwarf Galaxy ( 12.9 kiloparsecs) lying closer to the center of the Milky Way. It has a mass equivalent to approximately 10 billion times the mass of our Sun (10 solar masses), making it roughly 1/10 as massive as the Milky Way, and a diameter of about 14,000 light-years. The LMC is the fourth largest galaxy in the Local Group, the first, second and third largest places being taken by Andromeda Galaxy (M31), our own Milky Way Galaxy, and the Triangulum Galaxy (M33), respectively. While the LMC is often considered an irregular type galaxy (the NASA Extragalactic Database lists the Hubble sequence type as Irr/SB(s)m), the LMC contains a very prominent bar in its center, suggesting that it may have previously been a barred spiral galaxy. The LMC's irregular appearance is possibly the result of tidal interactions with both the Milky Way, and the Small Magellanic Cloud (SMC). It is visible as a faint "cloud" in the night sky of the southern hemisphere, straddling the border between the constellations of Dorado and Mensa. The very first recorded mention of the Large Magellanic Cloud was by the Persian astronomer, Abd Al-Rahman Al Sufi (later known in Europe as "Azophi"), in his Book of Fixed Stars around 964 AD. The next recorded observation was in 15034 by Amerigo Vespucci in a letter about his third voyage. In this letter he mentions "three Canopes, two bright and one obscure"; "bright" refers to the...More: http: //booksllc.net/?id=39374