Astronomers have revealed details of mysterious signals emanating from a
distant galaxy, picked up by a telescope in Canada. The precise nature
and origin of the blasts of radio waves is unknown.
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There are a number of theories about what could be causing them. They
include a neutron star with a very strong magnetic field that is spinning
very rapidly, two neutron stars merging together, and, among a minority
of observers, some form of alien spaceship.
https://www.bbc.com/news/science-environment-46811618