https://www.businessinsider.com/mystery-radio-waves-unknown-object-milky-way-center-2021-10Mysterious radio waves are emanating from the heart of our galaxy, and astronomers don't know what's making them.
All celestial objects emit radio waves — planets, stars, dead stars, and even asteroids. But researchers at the University of Sydney recently detected radio signals that do not match any known types. The waves, originating near the center of the Milky Way, don't seem to be coming from any kind of star, planet, or space rock that scientists have seen before.
Even stranger, the strength of this signal has waxed and waned dramatically over just a few months. Most objects in the galaxy, by contrast, don't change much year to year — and therefore nor do their radio waves.
"The signal switches on and off apparently at random. We've never seen anything like it," Ziteng Wang, the lead author of the new study and a PhD student in physics at the University of Sydney, said in a press release.
A paper describing the discovery was published Tuesday in The Astrophysical Journals. In it, Wang and his coauthors concluded that the mysterious source of this radio signal "may represent part of a new class of objects."