Current:Home > MarketsScientists tracked a mysterious signal in space. Its source was closer to Australia-Angel Dreamer Wealth Society D1 Reviews & Insights
Scientists tracked a mysterious signal in space. Its source was closer to Australia
View Date:2024-12-23 18:39:57
A mysterious signal that appeared to be emanating from the closest star to our own sun put scientists on a nearly yearlong hunt to track down its origin.
The result? The signal was not from an alien world circling Proxima Centauri but instead something much more mundane — possibly a radio, a telephone or even a computer located somewhere in Australia, according to two studies published this week in the journal Nature Astronomy.
"It is human-made radio interference from some technology, probably on the surface of the Earth," Sofia Sheikh, an astronomer at the University of California, Berkeley, and a co-author of both papers, told Nature.com. NPR tried to reach Sheikh but was unsuccessful.
The signal was first detected by a 210-foot radio telescope at the Parkes Observatory in New South Wales, Australia. "The Dish," as Australians call it, was the subject of a 2000 film of the same name, starring Sam Neill.
The radio telescope is part of Breakthrough Listen, the largest-ever scientific research program to listen for extraterrestrial "technosignatures." The program, launched in 2016, is based at Berkeley SETI Research Center, located at the University of California, Berkeley, but involves radio telescopes around the world.
How the search shifted from the stars back to Earth
"This was a really pernicious signal," Jason Wright, a professor of astronomy and astrophysics who is director of the Penn State Extraterrestrial Intelligence Center, tells NPR.
The signal, which lasted about five hours at 982 megahertz, was at a frequency normally reserved for aircraft communications. But the researchers eliminated that possibility — there were no aircraft in the area.
"This signal mimicked exactly what it is they were trying to find. And it's really rare. I mean, it's the first time in years that they've seen something like this," Wright says.
It had clear signs of being produced by technology, he says. It was at one specific frequency, whereas natural signals always show up over a range of frequencies. That alone is not surprising, he says, because there are lots of easily identifiable human-made signals that need to be sifted out all the time.
However, the signal didn't stay at the same frequency — it drifted, Wright says. "That's something that you expect from things that are actually in space," he says, because the Earth's spin causes a Doppler shift in the frequency.
Making it even more intriguing was that Proxima Centauri, a red dwarf star just 4.2 light-years from Earth, has two known planets. One of those planets has a minimum mass very close to Earth's and orbits the star in its "habitable zone," where liquid water could exist on the surface.
But when researchers looked for the signal again, it wasn't there.
If it wasn't aliens, then what was it? "You can make some guesses based on how the frequency is drifting. That suggests it's probably some cheap piece of electronics using a quartz oscillator," Wright says.
Astronomers are used to being disappointed by false alarms
Seth Shostak, a senior astronomer at the SETI Institute, tells NPR that he's ever hopeful of someday detecting an alien civilization, but his enthusiasm has been "tempered with time by realism."
"We've had false alarms in the past, and you get all excited only to be disappointed a couple of days later when you finally figure out that the signal was due to Homo sapiens, not the Klingons," Shostak says.
The 2019 signal was detected by the radio telescope as it spent 26 hours listening in the region of Proxima Centauri. But it went unnoticed until the following year. That's when Shane Smith, an undergraduate at Hillsdale College in Michigan, discovered the signal while sifting through data collected from Parkes.
Smith, who was working as a research intern with Breakthrough Listen, told his supervisor, University of California, Berkeley, astronomer Danny Price, who posted it to the Breakthrough Listen Slack channel. Price was initially skeptical.
"My first thought was that it must be interference," he told Nature. "But after a while I started thinking, this is exactly the kind of signal we're looking for."
Smith said he was excited but also skeptical, thinking there was a simple explanation. "I did not ever think the signal would cause such excitement," he said.
Sometimes space mysteries are explained; sometimes they go on
It's not the first false alarm for scientists who search for extraterrestrial intelligence.
In 2015, for example, Russian astronomers using a radio telescope in Zelenchukskaya, at the foot of the Caucasus Mountains north of Georgia, discovered an interesting beam-shaped signal. That turned out to be from a Russian military satellite.
Most famously, in 1977, astronomers looking at printouts from an observatory at Ohio State University known as the Big Ear detected a 72-second burst so unusual that one team member, Jerry Ehman, scrawled "Wow!" on the data sheet.
The "Wow! signal" has never been satisfactorily explained, Wright says. "People have pored over it," he says. "We're not going to suddenly have an aha moment where we figure out what that was. I suspect it'll just have to be a mystery unless it repeats."
veryGood! (1)
Related
- The Daily Money: Mattel's 'Wicked' mistake
- 2024 Republican National Convention begins today on heels of Trump assassination attempt. Here's what to know.
- Messi’s Copa America injury adds doubt for rest of 2024, 2026 World Cup
- 2024 Olympics: BTS' Jin Had a Dynamite Appearance in Torch Relay
- RHOP's Candiace Dillard Bassett Gives Birth, Shares First Photos of Baby Boy
- Stock market today: Asian shares are mixed as China reports its economy grew 4.7% in last quarter
- Shannen Doherty Officially Filed to End Divorce Battle With Ex Kurt Iswarienko One Day Before Her Death
- Watch live: President Biden speech from Oval Office Sunday after Trump rally shooting
- Lions find way to win, Bears in tough spot: Best (and worst) from NFL Week 10
- The RNC’s first day will still focus on the economy. Here’s what to know about Trump’s plans
Ranking
- Does the NFL have a special teams bias when hiring head coaches? History indicates it does
- Mass dolphin stranding off Cape Cod officially named the largest in U.S. history
- Barbora Krejcikova beat Jasmine Paolini in thrilling women's Wimbledon final for second Grand Slam trophy
- I’m a Shopping Editor, Here’s What I’m Buying From the Nordstrom Anniversary Sale 2024
- Younghoo Koo takes blame for Falcons loss to Saints: 'This game is fully on me'
- Lightning-caused wildfire in an Arizona forest still uncontained, leads to some evacuation orders
- How much money U.S., other countries are paying Olympic medalists at Paris Games
- Charmed's Holly Marie Combs Honors Fierce Fighter Shannen Doherty After Her Death
Recommendation
-
John Krasinski named People magazine’s 2024 Sexiest Man Alive
-
Steven Stamkos on move: 'I never thought this day would come'
-
Trump rally shooting victims: What we know about former fire chief Corey Comperatore, two others injured
-
Texas governor criticizes Houston energy as utility says power will be restored by Wednesday
-
Ashton Jeanty stats: How many rushing yards did Boise State Heisman hopeful have vs Nevada
-
A law passed last year made assault in an emergency room a felony. Did it help curb violence?
-
As a Nevada Community Fights a Lithium Mine, a Rare Fish and Its Haven Could Be an Ace in the Hole
-
Maps show location of Trump, gunman, law enforcement snipers at Pennsylvania rally shooting