2 Bizarre Ancient Galaxies Found in a Colossal Sea of Dark Matter
By Hanneke Weitering, Space.com Staff Writer | December 7, 2017 06:31am ET
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An artist's impression of a pair of galaxies from the very early universe.
Credit: D. Berry/NRAO/AUI/NSF
Two enormous galaxies seen merging in the distant universe have astronomers rethinking the leading theory of how galaxies form.
When the universe was in its infancy, the very first galaxies were tiny "dwarf galaxies" that clumped together to form the larger galaxies seen today. Known as hierarchical formation, this theory suggests that galaxies form in a step-by-step process as smaller galaxies are pulled together by their mutual gravitational attraction.
But now, the recent discovery of two distant galaxies that are abnormally huge has led astronomers to rethink that theory because it suggests that those dwarf galaxies assembled into large galaxies a lot faster than previously thought.
Astronomers at the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile were surprised to find that these gigantic galaxies existed when the universe was only 780 million years old, or about 5 percent of its current age of 13.8 billion years. Because the light from those galaxies takes about 13 billion years to reach Earth, astronomers observing those galaxies are looking back in time at how the galaxies appeared 13 billion years ago.
More:
https://www.space.com/39008-bizarre-ancient-galaxies-in-dark-matter-sea.html?utm_source=sdc-newsletter&utm_medium=email&utm_campaign=20171207-sdc
Science:
https://www.democraticunderground.com/122854774
Atacama Large Millimeter/submillimeter Array (ALMA) in Chile
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