Vanishing radio signals point to 4 mystery objects in our galaxy's core

They lost the radio signal, too, despite listening for months with two different radio telescopes.It reappeared suddenly, about a year after they first detected it, but within a day, it was gone again."Unfortunately, we don't quite know what behaves like that," Tara Murphy, a professor at the University of Sydney who led Wang's research team, told Insider.It was becoming clear that this was no ordinary dead star, like the other 2 million objects in their survey."That's when we started getting excited," Murphy said.The team sent their data to other radio astronomers, asking for theories. They studied the skies anew with the Very Large Array radio telescopes, but none of their signals turned up again.Wang and Murphy may have finally found another GCRT, but their discovery didn't shed much light on what these mysterious objects might be.Researchers have theories about the GCRTs, but "none of them are very satisfying," Murphy said.The GCRTs could be neutron stars or pulsars orbiting each other in sets of two or three, so that the radio signal from one star is eclipsed at irregular intervals by the others.