What a letdown.
The claims quickly went viral, spreading across Chinese state media and the Chinese social media platform Weibo before being reported by the international press and Live Science. But Werthimer says that, while the signals are certainly artificial, they're almost definitely from humans and not aliens.
"The big problem, and the problem in this particular case, is that we're looking for signals from extraterrestrials, but what we find is a zillion signals from terrestrials," Werthimer told Live Science."They're very weak signals, but the cryogenic receivers on the telescopes are super sensitive and can pick up signals from cell phones, television, radar and satellites — and there are more and more satellites in the sky every day.
In spite of this excitement, Werthimer's Chinese collaborators were nonetheless cautious to hedge their more sensational remarks, emphasizing the ultimate likelihood that the signals originated on Earth. "These are several narrow-band electromagnetic signals different from the past, and the team is currently working on further investigation," Zhang Tongjie, head scientist at the China Extraterrestrial Civilization Research Group at Beijing Normal University, said in the report."The possibility that the suspicious signal is some kind of radio interference is also very high, and it needs to be further confirmed and ruled out. This may be a long process.
The recent false alarm is one of several instances in which alien-hunting scientists have been misled by noise from human activity. In 2019, astronomers spotted a signal beamed to Earth from Proxima Centauri — the nearest star system to our sun and home to at least one potentially habitable planet. The signal was a narrow-band radio wave typically associated with human-made objects, which led scientists to entertain the thrilling possibility that it came from alien technology.
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