Strange ‘heartbeat’ signal picked up by astronomers from a galaxy far, far away

euronews.com:

Astronomers have detected a strange radio signal that emits periodically “like a heartbeat” and is coming from the depths of space.

Scientists at the Massachusetts Institute of Technology (MIT) in the United States were caught by surprise due to the intensity of the radio bursts, as well as their regularity.

The signal is classified as a fast radio burst (FRB), which are intense bursts of radio waves of unknown origin.

This one studied by scientists at MIT and other institutions is currently the longest-lasting FRB to date, with the clearest periodic pattern.

Named FRB 20191221A, the signal persists for much longer - around 1,000 times longer in fact - than the typical FRB, raising questions about what could be causing it.

FRBs tend to last for a few milliseconds at most, but FRB 20191221A goes on for up to three seconds, with radio waves repeating every 0.2 seconds in what the astronomers call a “clear periodic pattern”.

What could be causing it?

While mysterious radio signals from space often set off excited talk of potential communication from aliens, the explanation is likely that the signal comes from a rare type of star.

Astronomers suspect the signal could be coming from a type of neutron star, which are extremely dense, rapidly spinning collapsed cores of giant stars, left over from supernovas.

The scientists, publishing their work in the journal Nature, say it could be caused by a radio pulsar or magnetar star, both of which are types of neutron stars.

“There are not many things in the universe that emit strictly periodic signals,” said Daniele Michilli, from MIT’s Kavli Institute for Astrophysics and Space Research.

“Examples that we know of in our own galaxy are radio pulsars and magnetars, which rotate and produce a