<2> New SETI Study: Why We Might Have Been Missing Alien Signals
<3> The Search for Extraterrestrial Intelligence (SETI) has been ongoing for decades, with researchers scouring the cosmos for signs of intelligent life. However, a new study by the SETI Institute suggests that stellar “space weather” could be making it harder to detect radio signals from extraterrestrial intelligence.
<3> The study, led by Dr. Vishal Gajjar, an astronomer at the SETI Institute, highlights an overlooked complication in the search for technosignatures. Even if an extraterrestrial transmitter produces a perfectly narrow signal, it may not remain narrow by the time it leaves its home system. This is due to the effects of stellar activity and plasma turbulence near the transmitting planet, which can broaden the signal and make it more difficult to detect.
<3> The researchers created a practical framework for estimating how much broadening could occur for different types of stars, taking into account space weather. They used radio transmissions from spacecraft in our own solar system as a reference point, and then extrapolated to other stellar environments.
<3> The study’s co-author suggests that this new understanding could lead to better-targeted SETI searches. For example,