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Where was dark matter in early universe?

Saturday, March 18, 2017 3:35
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(Before It's News)


Dark matter – shown in red – may have been less concentrated in 
the early universe (right) than in the present-day universe (left)
, according to new observations.
 Artist’s concept via ESO/L. Calçada.


Surprising new observations of distant galaxies suggest that dark matter was less influential in the early universe than it is today.


The first direct evidence of dark matter appeared in the late 1970s, when Vera Rubin and Kent Ford of the Carnegie Institution of Washington observed the Andromeda Galaxy to be rotating all wrong. Stars and gas at its edges were moving just as fast as stars and gas near its center. 

This wasn’t just strange; it was contrary to established laws of motion saying that planets closer to the sun – or stars closer to the center of a galaxy – should move faster in orbit. 
For stars at a galaxy’s edges to be moving at the same speed as stars near a galaxy’s center suggested to astronomers in the 1970s that what we thought was a galaxy’s edge was not the edge, after all. 
And so astronomers began speaking of vast halos of unseen matter – or dark matter – surrounding galaxies. They’ve been talking about dark matter ever since.

Modern cosmology has embraced the idea of dark matter. Now, for example, astronomers believe that galaxies are made in a process whereby dark matter merges and clumps together. Galaxies and dark matter go hand in hand, like cake and ice cream, or love and marriage. That’s why it’s so surprising that new observations with the European Southern Observatory (ESO) Very Large Telescopein Chile indicate massive star-forming disk galaxies in the early universe were less influenced by dark matter than galaxies today.


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