Large galaxies only got so large through merging with other galaxies. Our Milky Way is already absorbing its two dwarf galaxy neighbours.
The galaxy NGC 5427 shines in this new NASA Hubble Space Telescope image. Image Credits: NASA, ESA, and R. Foley ; Processing: Gladys Kober
ARP 271 is one of the interacting pairs of galaxies imaged by Hubble. ARP 271 contains NGC 5427 and NGC 5426. The pair is about 130 million light-years distant and about 130 million light-years across. Hubble provided the image of NGC 5427, while a ground-based observatory provided the image of the ARP 271 pair. Image Credits: Ground-based image: DECam Victor M. Blanco/CTIO; Hubble image: NASA, ESA, and R. Foley ; Processing: Gladys Kober can heat gasMost galaxies have interacted with others, even if they haven’t merged. There are likely few galaxies that have interacted with a neighbouring galaxy at one time or another. There may be no pristine galaxies.
About 25% of galaxies are currently merging with others, according to the Harvard and Smithsonian Center for Astrophysics. Even more of them are interacting gravitationally, if not merging. The Milky Way is interacting with the Large and Small Magellanic Clouds, two irregular dwarf galaxies orbiting the Milky Way. That interaction is also creating a stream of gas called the Magellanic Stream.
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