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葡京网站:Science : Leftovers of the Milky Way's birth

作者:繁韭    发布时间:2019-02-27 06:19:01    

By Jeff Kanipe Toronto, Canada MYSTERIOUS, fast-moving clouds of hydrogen gas that have baffled astronomers since they were discovered in the 1960s may be leftover remains from the time when the Milky Way and other nearby galaxies were forming, claims a group of researchers from the US and the Netherlands. Hydrogen is found throughout the Universe and is the most abundant gas in the Milky Way. But in 1963, astronomers discovered clouds of hydrogen in space that were moving much faster than normal cosmic hydrogen. Further observations suggested that these high-velocity clouds were streams of gas either being drawn out of the Milky Way or falling into it. Leo Blitz of the University of California at Berkeley and colleagues from four other institutes in the US and the Netherlands used two ground-based radio telescopes to analyse the radiation emitted by the high-velocity hydrogen. They also re-evaluated infrared data from the COBE satellite and the Hubble Space Telescope. By matching the data to computer simulations of the motion of the galaxies, the researchers concluded that most, if not all,

 

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