Read more: http://space.newscientist.com/article/dn12790 The galaxy I Zwicky 18 is composed almost entirely of hydrogen and helium, the main ingredients forged in the big bang. It may have started to form stars billions of years ago, but it did so at a much slower rate than its peers. This video zooms in on the galaxy and was made from a wide-field image of the constellation Ursa Major (Courtesy: ESA/Hubble/M Kornmesser/L L Christensen/A Fujii/Digitized Sky Survey 2)
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