Astronomers find interesting source of mysterious radio signals

The Verge - Beginning in the late '90s, once or twice a year, astronomers operating the telescope at the Parkes Observatory in New South Wales, Australia would pick up mysterious radio signals. These signals were known as perytons, described in a recent report as "millisecond-duration transients of terrestrial origin." The researchers believed the perytons were linked to atmospheric activity such as lightning strikes, and they held this belief for around 17 years, until this year, when they installed a new receiver to monitor interference, The Guardian reports. The actual source of the perytons? A microwave.

The receiver detected signals at 2.4 GHz within 5 kilometers of the telescope, which the researchers realized were being created by staffers heating up their lunches in the Parkes Observatory kitchen. The interference only occurred when staffers opened the microwave door while it was still heating.

"If you set it to heat and pull it open to have a look, it generates interference," Simon Johnston, head of astrophysics at the Commonwealth Scientific and Industrial Research Organisation  told The Guardian. The telescope also had to be pointed toward the microwave to pick up the signals.