New observations reveal that the Small Magellanic Cloud, a dwarf galaxy near the Milky Way, is undergoing significant distortion due to gravitational forces from its larger neighbor, the Large Magellanic Cloud. For years, astronomers believed the stars within it followed a rotational pattern around its center. However, data gathered over 11 years using the VISTA telescope in Chile shows that stars are actually moving outward, directly toward the larger galaxy—a sign of tidal disruption. This challenges long-held assumptions about the galaxy’s internal dynamics.

The study, conducted in the infrared spectrum to pierce through cosmic dust, tracked millions of stars and found an average outward velocity of 17 kilometers per second. Over hundreds of millions of years, this motion has stretched the galaxy into its current irregular shape, suggesting it was once far more compact. The findings were published in Astronomy & Astrophysics and offer new insight into how satellite galaxies evolve under gravitational stress.

An additional mystery emerged: a group of ancient red giants within the Small Magellanic Cloud is moving collectively northward, a remnant motion from events two billion years ago. Since the Magellanic Clouds may be on their first approach to the Milky Way, this movement could reflect interactions from a distant cosmic past. Simulations suggest both galaxies will eventually be absorbed by the Milky Way billions of years from now, but in the meantime, the gravitational struggle continues.