Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.
Observing a distant and messy collision between galaxy clusters, astronomers have discovered that dark matter, the most mysterious"stuff" in the universe, passed through the wreckage like a cosmic phantom.was detected racing away from the conventional"normal" matter that comprises stars, planets, moons and everything we see around us in the colliding clusters.
It is this lack of interaction that makes scientists think dark matter can't be made up of the baryonic particles that comprise the atoms that make up stars, planets, moons and everything else we see around us. That's because these baryons do interact with each other and with light. The collision that forms the basis of MACS J0018.5+1626 is similar to that of the Bullet Cluster. What sets it apart is the fact that it's seen at a different angle, tilted at about 90 degrees relative to the Bullet Cluster. As a result, we see MACS J0018.5+1626 in such a way that it appears one galaxy is racing away from
A composite image of the Bullet Cluster, a much-studied pair of galaxy clusters that have collided head-on. One has passed through the other, like a bullet traveling through an apple, and is thought to show clear signs of dark matter separated from hot gases . "We had this complete oddball with velocities in opposite directions, and at first, we thought it could be a problem with our data. Even our colleagues who simulate galaxy clusters didn't know what was going on," Sayers explained."And then Emily got involved and untangled everything."Aiming to solve the puzzle of the MACS J0018.5+1626 smashup, Silich turned to data from Chandra, which revealed the temperature of the merger's hot gas and its location.
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