When black holes sigh

BOY, when black holes exhale, they sure don’t kid around.

Scientists are studying a gigantic plasma cloud that is six million light years wide (the Space.com article notes that an earlier press release erroneously said the cloud was 600 million light years wide), which could be the product of the “collective sigh of several supermassive black holes.”

Here’s an excerpt from the Space.com article:

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