No sign of extraterrestrial life? Blame it on bad space weather
18 March 2026
In the search for evidence of intelligent extraterrestrial life, astronomers, and organisations like SETI, often seek out narrowband radio signals.
Space is full of radio signals, most of them broadband, which usually occur naturally. Neutron stars are but one generator of such signals. Narrowband radio transmissions, on the other hand, are somewhat more likely to be created by an intelligent civilisation. On Earth, for instance, TV transmissions and mobile phones, are among sources of narrowband radio signals.
It makes sense then to look out for such signals in deep space. But some recent research conducted by SETI suggests narrowband radio signals may be disrupted by chaotic flows of ionised gas, and other sources of turbulence in the cosmos:
A new study by researchers at the SETI Institute suggests stellar “space weather” could make radio signals from extraterrestrial intelligence harder to detect. Stellar activity and plasma turbulence near a transmitting planet can broaden an otherwise ultra-narrow signal, spreading its power across more frequencies and making it more difficult to detect in traditional narrowband searches.
We keep coming up with explanations to account for the apparent absence of intelligent extraterrestrial life elsewhere in the universe. Now we’re blaming the weather.
The smart money says there is intelligent life somewhere in the cosmos, but it may not be all that common, nor particularly close to us. There’s a lot of space out there, beyond the solar system.
The size of the galaxy, to say nothing of the universe, is something many of us struggle to comprehend. Even if humanity possessed the means to travel at speeds close to the velocity of light, it would take over four years just to reach Proxima Centauri, the star presently closest to the Sun.
To visit the centre of our galaxy, the journey would take over twenty-five thousand years.
That’s not insignificant. In fact, twenty-five thousand light years constitutes a vast amount of space. An alien civilisation could be tucked in there somewhere, but it might take thousands of years for evidence of their presence to become apparent.
On paper, the chances of the existence of intelligent extraterrestrial life are better than even.
There are potentially millions, if not more, of exoplanets with environments conducive to complex life in the Milky Way galaxy alone. And if intelligent life can take hold on Earth, it can surely take hold elsewhere. But there are those who think intelligent life on Earth is a fluke, and a lot of things had to go the right way, over a period of billions of years, for this to happen.
Bad “weather” in deep space may well be playing a part in concealing the presence of extraterrestrial technological civilisations. But their scarcity, and extreme distance — potentially tens of thousands of light years — from Earth, probably better explains why there is no sign, yet, of anyone else.
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