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Tech & Science Andromeda galaxy was formed in 'recent' star crash: study

18:35  14 february  2018
18:35  14 february  2018 Source:   afp.com

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The Milky Way's neighbouring galaxy , Andromeda , was formed in a colossal crash between two smaller star systems no more than three billion When two different sized galaxies smash together, the larger galaxy stops the smaller one making new stars , according to a study of more than 20,000

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Calculating the birth date of the Andromeda galaxy has been a major challenge for astrophysicists © Provided by AFP Calculating the birth date of the Andromeda galaxy has been a major challenge for astrophysicists The Milky Way's neighbouring galaxy, Andromeda, was formed in a colossal crash between two smaller star systems no more than three billion years ago when Earth already existed, researchers said Wednesday.

Calculating the birth date of the galaxy has been a major challenge for astrophysicists given the vast age gap between the different stars it is made up of.

For the latest study, French and Chinese researchers led by Paris Observatory astronomer Francois Hammer used "the most powerful available computers in France" to crunch about a terabyte of data -- the equivalent of two million 500-kilobyte photos.

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The Milky Way's neighbouring galaxy , Andromeda , was formed in a colossal crash between two smaller star systems no more than three billion years ago when Earth already existed, researchers said Wednesday.

Paris (AFP) - The Milky Way's neighbouring galaxy , Andromeda , was formed in a colossal crash between two smaller star systems no more than three billion years ago when Earth already existed, researchers said Wednesday.

This allowed them to zoom in on "the physical mechanisms of the Andromeda formation, so lifting the veil on its origin," the observatory said in a statement.

The results were published in the Monthly Notices of the Royal Astronomical Society.

Previous research had noted one major difference between our own galaxy and Andromeda -- long considered twin clusters, the team pointed out.

In Andromeda, certain stars orbit erratically while in the Milky Way, all stars observe a simple rotation around the galaxy's centre.

Why?

The star agitation was due to the galaxy's "recent" formation, the team said.

The data showed that between seven and 10 billion years ago, two galaxies -- one four times more massive than the other -- found themselves on a collision course.

The team simulated both precursor galaxies' trajectories and calculated that they fused between 1.8 billion and three billion years ago to forge Andromeda.

Two reconstructions of the event can be seen here:

https://www.youtube.com/watch?v=zz86Dd_L7HY, and

https://www.youtube.com/watch?v=exetDytuUYQ

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