Radio Signal Crushes Alien Theory About Interstellar Comet 3I/ATLAS
Ever since astronomers
first detected interstellar comet 3I/ATLAS in July, speculation about its true nature has run wild. Some experts speculate it isn’t a comet at all but rather an
extraterrestrial spacecraft sent to sniff around our solar system.
New evidence has dumped cold water on this provocative hypothesis. MeerKAT, a radio telescope operated by the South African Radio Astronomy Observatory, recently detected a radio signal from 3I/ATLAS. Before you get excited, this isn’t a technological radio signal used for transmission. It’s a natural radio emission and some of the strongest evidence yet that 3I/ATLAS is a naturally occurring comet.
The astronomers who identified the signal posted a brief description of their findings on
The Astronomer’s Telegram, a website where researchers announce new astronomical discoveries. They explain that MeerKAT detected lines of radio absorption by hydroxyl radicals (OH) at two different frequencies: 1,665 megahertz and 1,667 megahertz. This indicates that 3I/ATLAS was behaving like a normal comet as it zipped around the Sun last month.
D.J. Pisano, a researcher and professor of extragalactic multi-wavelength astronomy at the University of Cape Town, reported the findings alongside several collaborators. The findings have not yet been peer reviewed.