Tag Archives: universe

Eavesdropping on Black Holes: Feasting Giants Sound Like Static

If you could hear the stuff that swirls around black holes, superdense white dwarfs and young stars, what would it sound like? Probably like the empty spaces on the radio dial, researchers say.

Simone Scaringi, a postdoctoral researcher at the Max Planck Institute in Germany, studies “accretion disks” around massive objects. An accretion disk is acollection of matter that gathers in a disc shape around a rotating object. Scaringi and his team looked at flickering in the light emissions of galactic nuclei, black holes, young stellar objects and white dwarfs, which are the collapsed remnants of massive stars. You can hear what accretion disks around black holes sound like here.
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Stormy seas in Sagittarius

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Dead galaxies protected by dark matter

  • ICRAR computer simulations consider dead galaxies
  • Galaxies in cluster held together by dark matter 
  • Cluster ‘quenches’ galaxy of hydrogen gas 

THE mysterious cosmic material dark matter has been credited with protecting dead galaxies in a cluster and preventing them from being ripped apart by the cluster’s enormous gravitational forces.
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