Galaxy lost two "arms" (Figure).

<P Align=center> Keywords: Galaxy lost "arms" </ P> <P align=center> </ P> <P align=center> new infrared image shows the Milky Way is only two main "arms" </ P .> <P align=center> </ P> <P align=center> previous galactic center of the Milky Way has started four main arms </ P> <P> According to the U.S. Space Network reported for decades, astronomers describe .out of the Milky Way has four major sports, "arms", however new images effectively cut off the two appendages, revealing the Milky Way only two main "arms" of the. .World Scientific reports </ P> <P> the University of Wisconsin, Robert Benjamin, said: "We do not intend to allow them to change their arm position, we only intend to let it change the focus of arms." Benjamin will be the group .The results published in the June 4 meeting of the American Astronomical Society meeting. .</ P> <P> at the meeting, other report also describes the evolution of our galaxy based images. .For example, Harvard - Smithsonian Center for Astrophysics (CfA) in the other study showed that a complete new stars around the galactic center arm one. .This new arm of the Milky Way is a known center of the left arm of the twins. .Harvard - Smithsonian Center for Astrophysics, another group has identified the stars in the spiral arms of the exact location and relative distance. .World Scientific reports </ P> <P> 1951, scientists first discovered the Milky Way's spiral arms. .Morphological astronomy at Yerkes Observatory presented his family, William Morgan, the results - that there are three hot stars in the Milky Way arm, and he were named Perseus (Perseus), Orion (Orion) and Sagittarius (Sagittarius ..) .Benjamin said: "This is the first three arms of the spiral galaxy. Indeed, he was at the American Astronomical Society meeting we received a warm applause, which is something I've never seen." </ P> <P> .After 60-80 years in the 20th century, with several groups of scientists using radio astronomy to map the Milky Way's structure, the emergence of different images, the spiral arm pattern and number vary. .Benjamin said: "Over the years, people in some areas based on research on the basis of the galaxy, or only one way to draw the entire galaxy image, unfortunately, when comparing different groups of models, they always have different views .. It's a bit like Mangrenmoxiang like. "After the basic unity of the galaxy image, and it has four arms, which is now Norma (Norma), long-shaped shield - Centaur (Scutum-Centaurus), Sagittarius (Sagittarius .) and Perseus (Perseus). .Our sun is located in a small named Orion (Orion) arm in the vicinity of some, but in the constellation Orion arm (Sagittarius) and Perseus (Perseus) arm between. .</ P> <P> the Milky Way released a new image is based on NASA's Spitzer Space Telescope in infrared light on the results of extensive observations of the galaxy were derived. .In the infrared heat of any object can be seen under this infrared wavelengths can penetrate dust, so the new galaxy images, including 800,000 snapshots and more than 110 million stars. .World Scientific reports </ P> <P> statistical methods through the use of stars, Benjamin and his colleagues noted that elongated shield - the direction of Centaurus arm increase in the number of stars, while the Sagittarius and Norma arms of stars in the direction of reduction. .Based on these findings, the new galaxy's two major arms of the image is elongated shield - Centaurus and Perseus. .</ P> <P> This finding confirmed a team of astronomers observed previously acquired - the Milky Way has two major arms, the center has "rung" is an ordinary galaxy structure. .The two main arms has the largest density of young stars and older red giants. .</ P> </ p>.