RF
Illustration of the Milky Way Galaxy
Astronomers have found that interstellar gas in the Milky Way often has low amounts of chemical elements. The believe this may due to cosmic gas that falls into the Milky Way in the form of high-velocity clouds with low numbers of heavy elements in them. This material provides 鈥渇uel鈥?for the formation of new stars but does not mix well with the interstellar medium, and can cause chemical inhomogeneities on scales of tens of parsecs., Photo by MARK GARLICK/SCIENCE PHOTO LIBRARY
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