This image shows an overview of the full Small Magellanic Cloud and was composed from two images from the Digitized Sky Survey 2, which digitized photographic surveys of the night sky. (ESA/Hubble)
If you're standing in the Southern Hemisphere on a clear night, you can see two luminous clouds offset from the Milky Way.
These clouds of stars are satellite galaxies of the Milky Way, called the Small Magellanic Cloud and the Large Magellanic Cloud, or SMC and LMC.
Using the newly released data from a new, powerful space telescope, University of Michigan astronomers have discovered that the southeast region, or "Wing," of the Small Magellanic Cloud is moving away from the main body of that dwarf galaxy, providing the first unambiguous evidence that the Small and Large Magellanic Clouds recently collided.
https://phys.org/news/2018-10-astronomers-collision-milky-satellite-galaxies.html
