Early Galaxies and Black Holes Grew Up Together

As galaxies feverishly churned out new stars in the early universe, the huge black holes at their hearts were firing off intense bursts of energy, a new study reveals.

The discovery could help explain why more massive galaxies host more massive central black holes, researchers said. And the find sheds light on the dynamics and growth of so-called "active galaxies" such as quasars, which were abundant in the early universe.

By contrast, many modern galaxies, including our own Milky Way, are inactive, with quiet central black holes and very low star-forming rates.

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