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Two billion years ago, our galaxy had a burst of star birth

23 May 2019, 13:00 UTC
Two billion years ago, our galaxy had a burst of star birth NASA/JPL-Caltech/ESO/R. Hurt

When you look up at the sky at night — provided you have decent eyesight and a dark site to view from — you can see thousands of stars. A good telescope can reveal millions.

Where did they come from? They exist, therefore it seems reasonable to assume they got their start at some point in the past. When?

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