Determination of the Milky Way is the latest mass of 1 trillion times the Sun (Figure).

<P Align=center> Keywords: Scientists galaxy mass solar </ P> <P align=center> </ P> <P align=center> scientists re-measured the quality of the Milky Way </ P> <P> Reuters ., a multinational team of scientists recently said they were the quality of the Milky Way recently re-measured the quality of New Milky Way is about 1 trillion times the mass of the sun. .</ P> <P> galaxy mass of 1 trillion times the sun </ P> <P> in a forthcoming issue of "Astrophysical Journal", scientists will publish their detailed the latest research results. .Scientists have previously estimated the mass of the Milky Way circles the sun's 750 billion times the mass to between 2 trillion times. .Later, they tend to a greater number of quality values. .However, astronomers have been using now more accurate method to determine the quality of the Milky Way mass of the sun should be about 1 trillion times. .Quality is the galaxy of stars, gas, dust and a mixture of the mysterious dark matter. .World Scientific reports </ P> <P> latest estimate is based on a large number of stars in the Milky Way halo sample basis, that is the main chart around the Milky Way relatively sparse sphere of stars. .Halo of stars by calculating the velocity, astrophysicists can infer that these stars are required to maintain the gravity around the orbit size. .The international research team leader, said in an interview: "Milky Way than we thought to be slim point, which means it contains dark matter than previously inferred to be less us, and it can more effectively the original .hydrogen and helium into stars. "</ P> <P> researchers said that the research data from the Sloan Digital Sky Survey (SDSS-III) site, which will greatly broaden the understanding of scientists of the Milky Way. .Michigan State University professor Titmouse - Beers explained: "The total mass of the galaxy is very difficult to measure out, because we are in the grip of difficulties. However, if we are to understand the galaxy formation process, or with the observation .to compare to other distant galaxies, it is necessary to estimate their quality, because it is a fundamental factor. "previous estimates are based is less than 500 objects of study, but the latest estimate is based on the 2400 .star research data. .Research team from the Max Planck Institute for Hans - Walter said: "The larger data set gives us a huge statistical advantage." </ P> <P> most of the known universe, the quality of the star .smaller than the sun, they are in the tens of billions of life around the dwarf star. .According to traditional theory of astronomy, which dwarfs the small size, so the kernel changes can produce large amounts of heavy elements, such as oxygen and iron. .The existing universe of these heavy elements are made even more rare, a larger volume of stars generated. .High brightness of these stars, dwarf life expectancy shorter than that. .So, can achieve star quality in the end how much? .This problem has plagued astronomers. .Scientists at the University of Bonn in Germany said they cluster near the arch, another cluster was observed, despite the small number of observed stars, but they also got similar results, that is, the upper limit of the galaxy stellar mass is the mass of the sun may be about .150 times. .Researchers believe that the astronomical community to think about now is why there may be upper stellar mass of the Milky Way. .World Scientific reports </ P> <P> galaxy far exceeds the previous estimate of thickness </ P> <P> a long time, scientists assumed that the thickness of the Milky Way about 6,000 light years away, but the analysis of observations obtained by the latest astronomical data, scientists .called the Milky Way about 12,000 light years the actual thickness is twice as scientists previously estimated. .To measure the size of the Milky Way, researchers studied the light emitted pulsars were studied. .The beam from the neutron star is very bright, just like in the universe emit searchlight. .The researchers said: "When the light emitted by pulsars fired us with the stars of the electronic interaction between the discrete, therefore slowing down the speed of light." Scientists say these electronic media for the warm ionized. .Relatively short blue light waves, the warm ionized medium long red light will have a greater impact. .By observing a red light in the blue light behind after the distance, scientists can program the pulsar through the amount of the warm ionized medium. .In addition, the warm ionized medium by comparing the light emitted by distant stars on the impact, researchers can determine where the warm ionized medium will stop, that is, to determine the galaxy's edge. .</ P> <P> researchers say, the Milky Way star system where the solar system, including about 200 billion stars and a large number of star clusters, nebulae, there are various types of interstellar gas and dust. .Most of the stars in the galaxy in a single room within flat ball, flat ball shaped like the discus. .Milky Way is a spiral galaxy with spiral structure, that there is a silver heart and two spiral arms, 4,500 light years away from the spiral arms. .Rotation speed of its parts and cycle, because the distance from the galactic center varies. .The sun from the Galactic center by about 2.3 million light years to 250 km / sec around the galactic center operation, operation of the cycle is about 2.5 billion years. .Mainly in the galactic disk stars in the form of material, accounting for less than 10% of the total mass of the Milky Way's interstellar matter, the vast majority are scattered within the galactic disk. .World Scientific reports </ P> </ p>.