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Determining which stars are actually clustered together requires many precise measurements over time. Price-Whelan started with the latest data collected by the Gaia spacecraft, which has measured and cataloged the distances and motions of 1.

Collision: Elastic, Inelastic Collisions in One and Two Dimensions, Videos

He searched the Gaia dataset for very blue stars, which are rare in the universe, and identified clumps of stars moving alongside them. After cross-matching with and removing known clusters, one remained. The newfound cluster is relatively young at million years old and is on the far outskirts of the Milky Way. So right away, I was like, 'Holy smokes, what is this? The cluster inhabits a region near a river of gas, dubbed the Magellanic Stream, that forms the outmost edge of the Large and Small Magellanic Clouds and reaches toward the Milky Way. Gas in the stream doesn't contain much metal, unlike gases in the outer reaches of the Milky Way.

David Nidever, assistant professor of physics at Montana State University in Bozeman, led an analysis of the metal content of the 27 brightest stars in the cluster. Just like the Magellanic Stream, the stars contain meager levels of metal.

Neutron Stars Collide

The researchers propose that the cluster formed as gas from the Magellanic Stream passed through the gases surrounding the Milky Way. This pass-through created a drag force that compressed the Magellanic Stream gas. This drag, along with tidal forces from the Milky Way's gravitational tug, condensed the gas enough to trigger star formation. Over time, the stars zoomed ahead of the surrounding gas and joined the Milky Way. The stars' presence presents a unique opportunity. Gauging the distance of gas from Earth is tricky and imprecise, so astronomers weren't sure how far the Magellanic Stream was from reaching the Milky Way.

The distance of stars, on the other hand, is comparatively trivial.

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Using the current positions and movements of stars in the cluster, the researchers predict that the edge of the Magellanic Stream is 90, light-years away from the Milky Way. That's roughly half the distance previously predicted. Right now, our galaxy is using up gas faster than its being replenished.

This extra gas coming in will help us replenish that reservoir and make sure that our galaxy continues to thrive and form new stars. The updated distance to the Magellanic Stream will improve models of where the Magellanic Clouds have been and where they're going, Price-Whelan says.

The improved numbers could even settle a debate over whether the Magellanic Clouds have crossed through the Milky Way before. Finding an answer to that question will help astronomers better understand the history and properties of our galaxy. Explore further. David L. Nidever et al.

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