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Other investors including Magnetar Capital and Founders Fund have also been in talks to participate in the round.

Magnetar Capital — an Evanston, Ill.-based hedge fund — could contribute up to $1 billion, according to multiple people, all of whom asked not to be identified because the information is private.

One possibility, the team says, is a highly magnetized neutron star, or magnetar, that has aged and slowed but somehow held onto its strong magnetic field.

A team in China that reported finding the same 44-minute LPT with the Daocheng Radio Telescope, in a preprint on arXiv last week, favors the magnetar idea.

Because the supernova remnant is still visible, the magnetar left behind ought to be relatively young—and still magnetically powerful.