D'Souza and Bell came to their conclusions after an in-depth look at the halo of the Andromeda galaxy.
Researchers have discovered that a massive galaxy-which was shredded by the Andromeda galaxy about two-billion years ago- is a sibling to the Milky Way, a discovery that could aid astronomers in understanding how disk galaxies like the Milky Way evolve and survive large mergers.
It was discovered by Richard Souza (Richard D'souza) and Eric bell (Eric Bell) from the University of MI, which publishes the journal Nature Astronomy, writes naked-science. "It was a "eureka" moment", said D'Souza in a statement. "We realized that we could use this information from Andromeda's outer star halo to infer the properties of the massive galaxy destroyed", said Richard D'Souza, a Ph.D. researcher at the University of MI. They said it started out at least 20 times bigger than any galaxy that has merged with our Milky Way over the course of its lifetime.
As per scientist, the Galaxy was third-largest members of the local group of galaxies.
A galaxy like Andromeda has not only destroyed this one. The theory is that when Andromeda destroyed M32p, it's center became the unique M32.
Professor Bell said: "M32 is a weirdo".
This hypothesis allows to explain the origin of dwarf elliptical galaxy M32 (companion of M31), which is itself unusual. It's one of the most compact galaxies is the universe. "There isn't another galaxy like it".
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Scientists have long known that this almost invisible large halo of stars surrounding galaxies contains the remnants of smaller cannibalised galaxies.
Initially, researchers thought that it will be hard to learn about any single of them.
"The Andromeda Galaxy, with a spectacular burst of star formation, would have looked so different two billion years ago", Bell explained.
The Milky Way had a previously unknown big sibling that was torn apart by the neighboring Andromeda galaxy long ago, a new study suggests. And considering that Andromeda is now on a collision course with the Milky Way, which will lead to a merger between the two galaxies in about 4 billion years, the more we know about mergers, the better. And according to new research, no galaxy in the Local Group knows this better than M32, an oddball satellite galaxy now orbiting Andromeda. But Andromeda and its spiral survived.
This discovery can also serve to unravel an ancient mystery: the formation of the "enigmatic satellite galaxy" M32, which is very dense and compact, and which experts suggest could actually be the nucleus of the lost sister of the Milky Way. The majority of the stolen mass went into forming M31's faint stellar halo, and the more concentrated, elongated structure of the giant stellar stream.