Many of our galaxy's star clusters may actually foreigners: collections of stars that were born elsewhere and then migrated to our Milky Way, according to a new study.
The foreign-born star clusters actually make up about one-quarter of the Milky Way globular star cluster system, researchers found.
"It turns out that many of the stars and globular star clusters we see when we look into the night sky are not natives, but aliens from other galaxies," said study co-author Duncan Forbes, an astronomer from Swinburne University of Technology in Australia. "They have made their way into our galaxy over the last few billion years."
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