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Guildford-based Supermassive Games, which specialises in "interactive horror movies", made couch co-op a standard mode in its titles after publishing its breakout hit Until Dawn.

They are just growing supermassive black holes, he said at a lecture at the 245th annual meeting of the American Astronomical Society, accompanied by a paper due to be published in The Astrophysical Journal.

Collaborations such as the NANOGrav Physics Frontiers Center use pulsars to study the gravitational wave background, which can help researchers understand the early Universe and the prevalence of gravitational-wave sources such as supermassive black-hole binaries.

"We now see that the culprit is the central supermassive black hole."

The culprit is the central supermassive black hole, not unlike the one at the center of most galaxies, including our own.