For the first time ever, using gravitational lensing (whereby light coming from the distant reaches of space can be seen to bend as it passes filaments of dark matter, as if through a lens), cosmologists have been able to map the structure of dark matter concentrated in filaments throughout the universe. According to news@nature.com,
"The map shows that, as predicted, the mysterious dark matter that makes up a quarter of the Universe forms a filamentous 'skeleton' upon which visible matter congregates, eventually producing stars. This is the first time such a large-scale three-dimensional picture of dark matter has been produced, and it will allow cosmologists to probe deeper into the nature of this elusive matter."
I still can't wait until they figure out what it actually is!
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