Technology 2 Bizarre Ancient Galaxies Found in a Colossal Sea of Dark Matter

10:20  11 december  2017
10:20  11 december  2017 Source:   MSN

Physicists keep striking out in the search for dark matter

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Want create site? Find Free WordPress Themes and plugins. An artist’s impression of a pair of galaxies from the very early universe. Around that same time in the ancient universe, dark matter — a mysterious, invisible form of matter that accounts for about a quarter of the universe’s mass

Around that same time in the ancient universe, dark matter — a mysterious, invisible "Our hope is to find more objects like this, possibly even more distant ones, to better understand this population of extreme dusty galaxies and especially their relation to the bulk population of galaxies at this epoch."

An artist's impression of a pair of galaxies from the very early universe.© D. Berry/NRAO/AUI/NSF An artist's impression of a pair of galaxies from the very early universe. 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.

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Around that same time in the ancient universe, dark matter — a mysterious, invisible “Our hope is to find more objects like this, possibly even more distant ones, to better understand this population of extreme dusty galaxies and especially their relation to the bulk population of galaxies at this epoch.”

Two enormous galaxies seen merging in the distant universe have astronomers rethinking the leading theory of how galaxies form. Astronomers at the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile were surprised to find that these gigantic galaxies existed when the universe was

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.

"With these exquisite ALMA observations, astronomers are seeing the most massive galaxy known in the first billion years of the universe in the process of assembling itself," Dan Marrone, an associate professor of astronomy at the University of Arizona in Tucson and lead author of the new paper, said in a statement.

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Two enormous galaxies seen merging in the distant universe have astronomers rethinking the leading theory of how galaxies form. Astronomers at the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile were surprised to find that these gigantic galaxies existed when the universe was

Two enormous galaxies seen merging in the distant universe have astronomers rethinking the leading theory of how galaxies form. Astronomers at the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile were surprised to find that these gigantic galaxies existed when the universe was

a star filled sky: A composite image shows ALMA data of the two galaxies of SPT0311-58 in red. These galaxies are shown over a background image from the Hubble Space Telescope.© Provided by Space.com A composite image shows ALMA data of the two galaxies of SPT0311-58 in red. These galaxies are shown over a background image from the Hubble Space Telescope. During this time period in the ancient universe, known as the epoch of reionization, space was saturated with an opaque fog of cold hydrogen gas. As the first stars formed, energy from their starlight began to ionize the hydrogen gas, breaking it down into a transparent soup of electrons and protons.

"We usually view that as the time of little galaxies working hard to chew away at the neutral intergalactic medium," Marrone said. “Mounting observational evidence with ALMA, however, has helped to reshape that story and continues to push back the time at which truly massive galaxies first emerged in the universe."

Around that same time in the ancient universe, dark matter — a mysterious, invisible form of matter that accounts for about a quarter of the universe's mass — also began to form clumps. As gravity pulled together clumps of both visible matter and dark matter, galaxies were born inside "halos" of dark matter. In a way, dark matter acts as scaffolding for young galaxies as they form by providing the gravity needed to pull mass together.

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Clickbait. People want to hear a colossal amount of dark matter instead of a little. It's actually the opposite. Aren't all other galaxies we observe ancient , given that they are so many light years away?

2 Bizarre Ancient Galaxies Found in a Colossal Sea of Dark Matter . 7 Dec 2017, 11:31 UTC.

In this case, astronomers saw that both giant galaxies reside inside one even more enormous dark-matter halo. The researchers said that this is one of the largest examples of a dark-matter halo ever discovered.

To top it off, the two galaxies appear to be merging and will someday form "the largest galaxy ever observed at that period in cosmic history," ALMA officials said in the statement. "This discovery provides new details about the emergence of large galaxies and the role that dark matter plays in assembling the most massive structures in the universe."

The two galaxies, collectively known as SPT0311-58, were originally spotted by astronomers at the South Pole Telescope in Antarctica. Initially, the scientists thought SPT0311-58 was a single galaxy, but further observations by ALMA found that SPT0311-58 is actually a pair of huge galaxies.

"There are more galaxies discovered with the South Pole Telescope that we're following up on," said Joaquin Vieira, a co-author of the study and astronomy professor at the University of Illinois. "Our hope is to find more objects like this, possibly even more distant ones, to better understand this population of extreme dusty galaxies and especially their relation to the bulk population of galaxies at this epoch."

The study was published online today (Dec. 6) in the journal Nature.

2 boys missing since Friday in Regina .
Regina police are searching for brothers who have been missing since Friday. Ashton Moise, 13, and Austin Moise, 12, are brothers. The boys were last seen on the 3300 block of Eastgate Dr. around 5 p.m. CST on Friday. Austin is Indigenous, approximately five-foot-six and 140 pounds, and has a dark complexion, black hair and brown eyes. Ashton is Indigenous, approximately five-foot-nine and 200 pounds, and has a dark complexion, straight black hair and brown eyes. Police do not believe they have come to any harm but are concerned about the boys due to their age.

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