Two collisions with a dwarf galaxy over the last nearly 2 billion years may have been the cause of the Milky Way's spiral arm structure, scientists say.
Source: http://www.msnbc.msn.com/id/44522620/ns/technology_and_science-space/
Two collisions with a dwarf galaxy over the last nearly 2 billion years may have been the cause of the Milky Way's spiral arm structure, scientists say.
Source: http://www.msnbc.msn.com/id/44522620/ns/technology_and_science-space/
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