Though images from the Spitzer Space Telescope in 2008 showed the Milky Way as having only two spiral arms, which conflicted with 50 years of previous evidence, this latest study shows that massive stars may have been responsible for the confusion.

Though images from the Spitzer Space Telescope in 2008 showed the Milky Way as having only two spiral arms, which conflicted with 50 years of previous evidence, this latest study shows that massive stars may have been responsible for the confusion.