Monster black holes may have murdered their host galaxies in the early universe

Further evidence that some monster black holes killed star formation in their galaxies has been revealed in a study that dates back 12.5 billion years to the early universe.

Stars form when cold clouds of molecular hydrogen gas collapse, fragment and condense. The process of star formation continues in the Milky Wayas is the case in many other galaxies, but some, such as large elliptical galaxiesseem to have ended their star formation billions of years ago.

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