China’s FAST telescope detected a narrowband signal from the direction of exoplanet K2-155d, but researchers say human interference is the likely explanation.
A candidate signal, not a greeting
Astronomers using China’s Five-hundred-meter Aperture Spherical Telescope, better known as FAST, detected a narrowband radio signal from the direction of K2-155d, a super-Earth about 238 light-years away. Narrowband signals attract SETI attention because natural cosmic radio sources usually spread energy across broader frequencies. That makes the detection interesting. It does not make it aliens.
The planet is worth studying
K2-155d orbits a red dwarf and has been discussed as a possible temperate-world candidate, although its actual atmosphere and surface conditions remain uncertain. “Super-Earth” describes size, not beachfront property. The planet may be rocky, gaseous or inhospitable in ways current observations cannot resolve.
Why interference is winning
Researchers found features that point toward radio-frequency interference from human technology. Signals can enter observations through satellites, aircraft, telecommunications equipment or electronics near a telescope. A detection also needs to repeat in a way connected to the target’s position. If it appears everywhere, vanishes permanently or behaves like known equipment, the cosmic explanation loses ground quickly.
SETI works by rejecting excitement
Serious searches for extraterrestrial intelligence collect candidates and then try to destroy them with ordinary explanations. Teams compare off-target observations, check known transmitters, examine frequency drift and seek independent confirmation. Most candidates fail. That is not embarrassment; it is the method doing its job before a headline starts designing the alien ambassador’s motorcade.
What is verified
FAST recorded a signal with characteristics worth examining from the direction of K2-155d. Scientists have not confirmed that it originated at the planet, that it was artificial extraterrestrial technology or that life exists there. The current assessment leans toward terrestrial interference. The useful result is the follow-up process: better filters, better observing strategies and one more reminder that “unexplained at first” is not the same sentence as “aliens confirmed.”
Sources: Original reporting and source context.
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