David Bridges
For many years, astronomers have predicted that, in roughly 4.5 billion years, our galaxy will merge with the close by Andromeda galaxy in a large collision that can dramatically reshape our rapid cosmic neighborhood. However what if this doomed encounter isn’t inevitable and every galaxy will stay intact?
Earlier analysis prompt that the upcoming collision between the 2 galaxies was inevitable, however a brand new research claims there’s a 50% probability the Milky Manner might narrowly keep away from Andromeda. The research, obtainable on the preprint server arXiv, questions the knowledge of a galactic collision, as hinted by its title: “Apocalypse When?” The paper is presently present process peer evaluate.
For greater than a century, scientists have noticed the Andromeda galaxy, which is positioned 2.5 million light-years away, slowly sneaking up on the Milky Manner in what has been predicted to lead to a head-on collision. “The universe is increasing and accelerating, and collisions between galaxies in shut proximity to one another nonetheless occur as a result of they’re sure by the gravity of the darkish matter surrounding them,” in keeping with NASA.
In 2021, NASA’s Hubble telescope captured photos of stars in Andromeda, which scientists then analyzed to find out that the galaxy is transferring in direction of the Milky Manner at a pace of 250,000 miles per hour. From there, scientists claimed they may predict with certainty the head-on encounter scheduled in about 4 billion years. On the time, laptop simulations prompt that it might take an extra two billion years for the 2 galaxies to completely merge with one another and reshape into one elliptical galaxy, with our photo voltaic system flung into a totally new area in relation to the galactic core.
The researchers behind the brand new research, co-authored by Until Sawala, an astrophysicist on the College of Helsinki, used latest observations from the Gaia and Hubble telescopes to research the movement and mass of the most important galaxies within the Native Group: Andromeda (the most important), the Milky Manner, Triangulum, and the Massive Magellanic Cloud. The crew then plugged these calculations right into a simulation that predicted the galaxies’ evolution over the subsequent 10 billion years.
By means of the simulations, the crew discovered that the Milky Manner and Andromeda solely merged in barely lower than half of the situations. “Because it stands, proclamations of the upcoming demise of our Galaxy seem vastly exaggerated,” the researchers wrote within the research.
The research additionally means that upcoming Gaia information will additional refine measurements of the movement and mass of Native Group galaxies, and that extra work is required earlier than the destiny of our galactic neighborhood can really be decided.
Daniel Mercer
