New research suggests that space storms and stellar activity could distort radio signals sent from distant planets, making them difficult for Earth-based telescopes to identify.
Scientists searching for signs of alien life believe extraterrestrial signals may be harder to detect because of turbulent space weather.
The findings come from researchers at the SETI Institute, a Silicon Valley–based organization dedicated to the search for extraterrestrial intelligence. The institute said space weather around distant stars may be interfering with radio signals that could potentially come from alien civilizations.
For decades, scientists have scanned the skies for signals that might indicate intelligent life beyond Earth. These signals are often called technosignatures. It means signs of technology created by an advanced civilization.
The study suggests that even if alien civilizations are transmitting radio signals, those signals may not reach Earth in the same form they were sent.
SETI astronomer Vishal Gajjar, who worked on the research, said the environment around stars could affect these transmissions.
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“If a signal gets broadened by its own star’s environment, it can slip below our detection thresholds, even if it’s there,” Gajjar said. “That could help explain some of the radio silence we’ve seen in technosignature searches.”
The research was co-authored by SETI research assistant Grayce C. Brown and published in The Astrophysical Journal.
According to the scientists, the space around stars is not always calm. Stars frequently produce powerful bursts of energy such as solar storms, stellar winds, and coronal mass ejections. These events release charged particles and create turbulent plasma environments.
Such conditions can interfere with radio waves traveling through space.
Researchers say these disturbances can stretch and distort radio signals. When that happens, a signal that originally travels on a very narrow frequency band spreads across a wider range.
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This process weakens the signal’s peak strength and makes it harder for current detection systems to recognize.
Scientists searching for alien signals usually focus on extremely narrow radio frequencies. They assume that intelligent civilizations would send signals in a clear, precise band of frequencies that stand out from natural cosmic noise.
However, the new study suggests those signals might become blurred before they reach Earth.
“Plasma density fluctuations in stellar winds and eruptions like coronal mass ejections can distort radio waves near their point of origin,” researchers explained in a statement about the study. “This effect can smear the signal’s frequency and reduce the strength on which our detection systems rely.”
In simple terms, scientists believe alien signals could be getting scrambled by space weather before they reach our planet.
The research team tested this idea by studying radio transmissions from spacecraft within our own solar system. They examined how solar activity affected these signals and then applied the same principles to stars in distant planetary systems.
By comparing the effects, researchers were able to estimate how much stellar activity might distort signals traveling from faraway worlds.
The findings suggest that current search methods may need to change.
Brown said scientists may have to adjust their strategies to improve the chances of detecting alien signals.
“By quantifying how stellar activity can reshape narrowband signals, we can design searches that match what actually arrives at Earth,” Brown said. “We should not only focus on what might have been transmitted.”
That means future searches could include scanning wider frequency ranges or observing at higher frequencies where signals may remain clearer.
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The question of whether humans are alone in the universe has fascinated scientists and the public for centuries. In recent years, discussions about unidentified flying objects, now officially called unidentified anomalous phenomena (UAP), have brought renewed attention to the possibility of extraterrestrial life.
Several reports and claims have fueled public curiosity.
In 2024, a former US defense official told Congress that government employees had reportedly been injured during encounters with unidentified phenomena. However, the claims were not supported by verified evidence.
Earlier, whistleblower David Grusch, a former intelligence officer who worked on a government task force studying UAP, claimed the Pentagon had operated a secret program to collect and study crashed alien spacecraft. US officials have not confirmed those claims.
US Congressman Tim Burchett, who is involved in congressional discussions on UAP investigations, dismissed some of the speculation.
“We’re not bringing little green men or flying saucers into the hearing,” Burchett said.
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Government reports also show that sightings of unexplained objects remain relatively common. A 2024 report revealed that more than 750 new UAP sightings were recorded between May 2023 and June 2024.
Public interest in aliens increased again when former US President Barack Obama joked during a podcast that aliens might be real. He later clarified on social media that he had not seen any evidence supporting that claim.
The debate even reached political circles. Then, President Donald Trump said he would consider releasing government files related to aliens and unidentified aerial phenomena.
“I don’t know if they’re real or not,” Trump told reporters while traveling on Air Force One.
Despite the speculation, scientists emphasize that the search for extraterrestrial life continues through careful research and observation.
The new study from the SETI Institute highlights an important possibility. Alien civilizations may not be silent. Instead, their signals could be hidden behind the cosmic interference of space itself.
