Home > Astronomy, Cosmology, Galaxies, General Astronomy > When Galaxies Eat Galaxies: Gravity Lenses Suggest Big Collisions Make Galaxies Dense

When Galaxies Eat Galaxies: Gravity Lenses Suggest Big Collisions Make Galaxies Dense


Using gravitational “lenses” in space, University of Utah astronomers discovered that the centers of the biggest galaxies are growing denser – evidence of repeated collisions and mergers by massive galaxies with 100 billion stars.

“We found that during the last 6 billion years, the matter that makes up massive elliptical galaxies is getting more concentrated toward the centers of those galaxies. This is evidence that big galaxies are crashing into other big galaxies to make even bigger galaxies,” says astronomer Adam Bolton, principal author of the new study.

“Most recent studies have indicated that these massive galaxies primarily grow by eating lots of smaller galaxies,” he adds. “We’re suggesting that major collisions between massive galaxies are just as important as those many small snacks.”

Full Story: http://unews.utah.edu/news_releases/when-galaxies-eat-galaxies/

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