Attack of the Kraken on Milky Way

Scientists learned of the ancient collision for the first time this year while using artificial intelligence (AI) to study tight-knit groups of stars called globular clusters.

One of the most epic things ever to happen to the Milky Way went down more than 10 billion years ago, when a monster galaxy named the Kraken crashed head-on into ours. The Milky Way was young at the time and about four times less massive than it is today, scientists found in an October 2020 study, which means that merger likely reshaped our galaxy more than any other galactic collision in history, the team wrote.

Scientists learned of the ancient collision for the first time this year while using artificial intelligence (AI) to study tight-knit groups of stars called globular clusters. Clusters that share the same properties (such as the ages and chemical compositions of their stars) likely entered our galaxy during the same ancient mergers. The team found evidence of five large-scale mergers — four of which we already knew about, and the fifth being the Kraken.

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