Where you have a large mass like a galaxy cluster, there is strong gravity and space-time is severely warped, causing time to move more quickly.
Since these powerful blasts of material significantly affect the surrounding galaxy, and even galaxy cluster in some cases, this work fits into the larger picture.
Kashlinsky and colleagues first noticed the dark flow when studying the way gas in galaxy clusters interacts with the cosmic microwave background radiation.
The telescopes sift through the background cosmic radiation to find spots where it has been slightly perturbed as it passes through extremely hot gas, a hallmark characteristic of galaxy clusters.
The researchers found that four separate galaxy clusters are involved in a triple merger, the first time such a phenomenon has been documented.
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