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Everything we thought we knew about our galaxy's origin might be wrong


 
TORONTO
Astronomers in Australia say they ve made a discovery that calls into question our belief in how our galaxy was formed.
As explained by NASA, the creation of galaxies is believed to involve small clouds of stars and careening through space and occasionally colliding with each other, slowly growing until they reach galactic size.
However, scientists have long contended that when the Milky Way was formed somewhere around 12 billion years ago, it wasn t because of this gradual process, but because of two galaxies slamming together.
This theory posits that one of the two galaxies was much larger than the other, which could explain why the Milky Way s shape includes both a thick disk of older stars and a thin disk of newer ones. ....

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Milky Way no freak accident, astronomers say


Date Time
Milky Way no freak accident, astronomers say
Detailed study by University of Sydney astronomers of a galaxy 320 million light years away reveals striking similarities to our own home.
Panorama photo of the Milky Way at the European Southern Observatory in Chile. Photo: H. Hayer/ESO
The first detailed cross-section of a galaxy broadly similar to the Milky Way, published today, reveals that our galaxy evolved gradually, instead of being the result of a violent mash-up. The finding throws the origin story of our home into doubt.
The galaxy, dubbed UGC 10738, turns out to have distinct ‘thick’ and ‘thin’ discs similar to those of the Milky Way. This suggests, contrary to previous theories, that such structures are not the result of a rare long-ago collision with a smaller galaxy. They appear to be the product of more peaceful change. ....

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