The galaxy that grew up too fast

In the early days of the Hubble Space Telescope, astronomers, eager to see how far out in space — and how far back in time — their new instrument could peer, pointed it at an empty tract of sky. What returned was an image of space littered with what the astronomer Alan Dressler of the Carnegie Observatories called “train wrecks”: irregular, fragmented clouds of stars known as protogalaxies, flecks of starlight scattered like orphan jigsaw puzzle pieces across the primordial heavens.

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