COLLIDING GALAXIES.

The article focuses on the uncertain future collision between the Milky Way and the neighboring Andromeda galaxy. While earlier studies suggested an inevitable collision in about 5 billion years, a recent study led by researchers at the University of Helsinki used data from NASA's Hubble Space Telescope and the European Space Agency's Gaia telescope to run extensive simulations, factoring in the gravitational effects of satellite galaxies such as Andromeda's Messier 33 and the Milky Way's Large Magellanic Cloud. These simulations indicate that the probability of a collision within the next 10 billion years ranges from about 50 to 66 percent, with the eventual engulfing of the Large Magellanic Cloud by the Milky Way further complicating predictions. If a merger occurs, it would be a gradual process over billions of years, resulting in a larger elliptical galaxy and the merging of the central black holes into a quasar, rather than a sudden impact. [Extracted from the article]