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Milky Way still reeling from ancient smash

Milky Way still reeling from ancient smash

作者:杭铜镇  时间:2019-03-14 02:02:00  人气:

OUR galaxy may still be reeling from a massive collision with another galaxy 2 billion years ago. Some groups of stars near our solar system move with unusually high velocities compared with others in the galactic disc. Ivan Minchev of the University of Strasbourg, France, says their pattern and velocity can be explained if they were thrown by the shock of a past smash. Minchev developed a computer simulation of the distribution of velocities of billions of stars. This is far more than have been modelled previously,