Alien life could already be on Earth, scientist says

LONDON — For the past 50 years, scientists have scoured the skies for radio signals from beyond our planet, hoping for some sign of extraterrestrial life. But one physicist says there’s no reason alien life couldn’t already be lurking among us — or maybe even in us.

Paul Davies, an award-winning Arizona State University physicist known for his popular science writing, said today that life may have developed on Earth not once but several times.

Davies said the variant life forms — most likely tiny microbes — could still be hanging around “right under our noses — or even in our noses.”

ADVERTISEMENT
0 seconds of 0 secondsVolume 0%
Press shift question mark to access a list of keyboard shortcuts
00:00
00:00
00:00
 

“How do we know all life on earth descended from a single origin?” he asked a conference at London’s prestigious Royal Society, which serves as Britain’s academy of sciences. “We’ve just scratched the surface of the microbial world.”

The idea that alien micro-organisms could be hiding out here on earth has been discussed for a while, according to Jill Tarter, the director of the U.S. SETI project, which listens for signals from civilizations based around distant stars.

She said several of the scientists involved in the project were interested in pursuing the notion, which Davies earlier laid out in a 2007 article published in Scientific American in which he asked: “Are aliens among us?”

So far, there’s no answer. And ever finding one would be fraught with difficulties, as Davies himself acknowledged.

Unusual organisms abound — including chemical-eating bacteria which hide out deep in the ocean and organisms that thrive in boiling-hot springs — but that doesn’t mean they’re different life forms entirely.

“How weird do they have to be suggest a second genesis as opposed to just an obscure branch of the family tree?” he said. Davies suggested that the only way to prove an organism wasn’t “life as we know it” was if it were built using exotic elements that no other form of life had.

Such organisms have yet to be found. Davies also noted that less than 1 percent of all the world’s bacteria had been comprehensively studied — leaving plenty of time to find unusual organisms.

“You cannot tell just by looking that a microbe has some radically different inner chemistry,” he said.

Davies’ call for alien-hunting scientists to look to their own backyards came as one of the pioneers of the search for extraterrestrial intelligence told the conference the job of finding proof of alien life in outer space may be more difficult than previously thought.

Frank Drake, who conducted the first organized search for alien radio signals in 1960, said that the Earth — which used to pump out a loud mess of radio waves, television signals and other radiation — has been steadily getting quieter as its communications technology improves.

Drake cited the switch from analogue to digital television — which uses a far weaker signal — and the fact that much more communications traffic is now relayed by satellites and fiber optic cables, limiting its leakage into outer space.

“Very soon we will become very undetectable,” he said. If similar processes were taking place in other technologically advanced societies, then the search for them “will be much more difficult than we imagined.”

But Drake said scientists at SETI were excited by the possibility of using lasers to send super-bright flashes of light into space for a tiny fraction of a second. The flashes could theoretically be seen up by an advanced civilization up to 1,000 light years away, and Tarter said infrared versions of the devices could possibly send beams even further.

But Drake noted that the interstellar equivalent to turning a flashlight on and off only works if a prospective alien civilization wants to get in touch to begin with.

“For this to work … There has to be altruism in the universe,” he said.

Talk to us

> Give us your news tips.

> Send us a letter to the editor.

> More Herald contact information.

More in Local News

Snohomish County Health Department Director Dennis Worsham on Tuesday, June 11, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
Snohomish County Health Department director tapped as WA health secretary

Dennis Worsham became the first director of the county health department in January 2023. His last day will be July 3.

Julia Zavgorodniy waves at her family after scanning the crowd to find them during Mariner High School’s 2025 commencement on Friday, June 13, 2025, at Angel of the Winds Arena in Everett, Washington. (Olivia Vanni / The Herald)
‘Dream without limit’: Thousands of Snohomish County seniors graduate

Graduations at the arena conclude this weekend with three Everett high schools on Saturday and Monroe High School on Sunday.

Police Cmdr. Scott King answers questions about the Flock Safety license plate camera system on Thursday, June 5, 2025 in Mountlake Terrace, Washington. (Olivia Vanni / The Herald)
Mountlake Terrace approves Flock camera system after public pushback

The council approved the $54,000 license plate camera system agreement by a vote of 5-2.

Cascadia College Earth and Environmental Sciences Professor Midori Sakura looks in the surrounding trees for wildlife at the North Creek Wetlands on Wednesday, June 4, 2025 in Bothell, Washington. (Olivia Vanni / The Herald)
Cascadia College ecology students teach about the importance of wetlands

To wrap up the term, students took family and friends on a guided tour of the North Creek wetlands.

Community members gather for the dedication of the Oso Landslide Memorial following the ten-year remembrance of the slide on Friday, March 22, 2024, at the Oso Landslide Memorial in Oso, Washington. (Ryan Berry / The Herald)
The Daily Herald garners 6 awards from regional journalism competition

The awards recognize the best in journalism from media outlets across Alaska, Idaho, Montana, Oregon and Washington.

Edmonds Mayor Mike Rosen goes through an informational slideshow about the current budget situation in Edmonds during a roundtable event at the Edmonds Waterfront Center on Monday, April 7, 2025 in Edmonds, Washington. (Olivia Vanni / The Herald)
Edmonds mayor recommends $19M levy lid lift for November

The city’s biennial budget assumed a $6 million levy lid lift. The final levy amount is up to the City Council.

A firefighting helicopter carries a bucket of water from a nearby river to the Bolt Creek Fire on Saturday, Sep. 10, 2022, on U.S. 2 near Index, Washington. (Ryan Berry / The Herald)
How Snohomish County property owners can prepare for wildfire season

Clean your roofs, gutters and flammable material while completing a 5-foot-buffer around your house.

(City of Everett)
Everett’s possible new stadium has a possible price tag

City staff said a stadium could be built for $82 million, lower than previous estimates. Bonds and private investment would pay for most of it.

Jennifer Humelo, right, hugs Art Cass outside of Full Life Care Snohomish County on Wednesday, May 28, 2025 in Everett, Washington. (Olivia Vanni / The Herald)
‘I’ll lose everything’: Snohomish County’s only adult day health center to close

Full Life Care in Everett, which supports adults with disabilities, will shut its doors July 19 due to state funding challenges.

‘No Kings’ rallies draw thousands to Everett and throughout Snohomish County

Demonstrations were held nationwide to protest what organizers say is overreach by President Donald Trump and his administration.

Marysville is planning a new indoor sports facility, 350 apartments and a sizable hotel east of Ebey Waterfront Park. (Olivia Vanni / The Herald)
New report shifts outlook of $25M Marysville sports complex

A report found a conceptual 100,000-square-foot sports complex may require public investment to pencil out.

Logo for news use featuring Snohomish County, Washington. 220118
Snohomish County Board of Health looking to fill vacancy

The county is accepting applications until the board seat is filled.

Support local journalism

If you value local news, make a gift now to support the trusted journalism you get in The Daily Herald. Donations processed in this system are not tax deductible.