NASA's Hubble Sees Aftermath of Galaxy's Scrape with Milky Way

November 14, 2024 10:00AM (EST)Release ID: 2024-031
A whitish, whirlpool-like galaxy at middle of top edge, and a tadpole-shaped structure sweeps from left to right across lower half. A label pointing to outer, left of galaxy reads "Earth." Faint, purple haze labeled "Milky Way Halo" surrounds galaxy and stretches to graphic's edges.  The tadpole-shaped object is the Large Magellanic Cloud, or LMC, with its own halo and streaming tail. Semi-circular, progressively darker layers of purple labeled "LMC Halo" surround the LMC, which appears roughly circular, with a central, light yellow bar. Cloud-like features sprinkled with white specks surround this bar. Trailing the LMC is a large, tail-like feature labeled "Stream." Three light blue lines point from the label "Earth" through the LMC's halo, and to three corresponding quasars, which are off screen. At the bottom, right corner is the label "Artist's Concept."

Summary

Encounter Blew Away Most of Smaller Galaxy's Gaseous Halo

In an epic story of survival witnessed by the Hubble Space Telescope, one of our nearest galactic neighbors has crashed through the Milky Way galaxy's gaseous halo and lived to tell the tale. But in the process, this dwarf galaxy, called the Large Magellanic Cloud (LMC), has been stripped of most of its own surrounding halo of gas. Researchers were surprised to find such an extremely small gaseous halo remaining – one around 10 times smaller than halos of other galaxies of similar mass. Still, the LMC has held onto enough of its gas to keep forming new stars. A smaller galaxy wouldn't have survived such an encounter. This is the first time astronomers have been able to measure the size of the LMC's halo – something they could do only with Hubble.

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