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Why The Discovery Of The Milky Way’s ‘Dark Twin’ Is Such A Big Deal

Astronomers have detected a vast star done adult roughly wholly of low matter, an astonishing find that could move us one step closer to bargain what a puzzling things is all about.

Dubbed Dragonfly 44, a collection of stars lies about 330 million light-years from Earth in a organisation of galaxies famous as a Coma cluster. It’s about a distance of a possess Milky Way star though much, most fainter. It contains usually about 1 billion stars, that is roughly 1 percent a series of stars in a galaxy. 

And 99.99 percent of a mass in what some are job “the Milky Way’s low twin” is in a form of low matter, an invisible piece that is believed to make adult 85 percent of all in a universe. Dark matter can be “seen” in a approach if affects a transformation of stars within galaxies though it has never been directly celebrated ― at least, not with any certainty.

The group of astronomers who detected Dragonfly 44 with a assistance of Hawaii’s W. M. Keck Observatory were totally astounded to find a low galaxy.

“We knew about other galaxies that are roughly wholly low matter, though those are little dwarf galaxies that are about a million times reduction large than Dragonfly 44,” Yale University astronomer Pieter outpost Dokkum, lead author of a paper about a discovery that was published final week in The Astrophysical Journal Letters, told The Huffington Post.

“It is an sparkling discovery,” pronounced Jeremiah Ostriker, an astrophysicist during Columbia University. “It gives us a possibility to investigate [dark matter] in fact ― close-up.”

How do we know Dragonfly 44 is done of low matter if we can’t see a stuff?

The larger a galaxy’s altogether mass, a faster a stars move relations to any other. And a stars in Dragonfly 44 “move during velocities that are distant larger than approaching for such a low galaxy,” Roberto Abraham, a University of Toronto astronomer and a co-author of a paper, pronounced in a news release. “It means that Dragonfly 44 has a outrageous volume of secret mass.”

In other words, oodles of low matter.

Theory binds that low matter particles destroy any other and evacuate gamma deviation whenever they collide, outpost Dokkum said. Scientists have been acid for this particular vigilance in dwarf low galaxies, he added, though a vigilance would be most stronger in a large low matter star like Dragonfly 44.

“The competition is on to find large low galaxies are even closer to us than Dragonfly 44, so we can demeanour for handicapped signals that might exhibit a low matter particle,” he pronounced in a news release. 

Stay tuned!

Article source: http://www.huffingtonpost.com/entry/dragonfly-44-dark-matter_us_57c0b0f6e4b04193420f3d41