•   
  •   

US News A radio signal is coming from space every 16 days. What the hell is it?

10:20  14 february  2020
10:20  14 february  2020 Source:   vox.com

Elon Musk's SpaceX signs deal to send tourists into space

  Elon Musk's SpaceX signs deal to send tourists into space Elon Musk's company SpaceX has signed a contract with a space tourism company to send up to four passengers into orbit around the Earth. The contract with Space Adventures will see space tourists get up to five days in orbit inside one of the company's Crew Dragon spacecraft.SpaceX's president and chief operating officer Gwynne Shotwell said: "This historic mission will forge a path to making spaceflight possible for all people who dream of it." © Getty The missions will use a Falcon 9 rocket carrying the Crew Dragon capsule It is unlikely to be possible for those who dream of it any time soon.

What the hell is it ? Fast radio bursts are one of astronomy’s tantalizing unsolved mysteries. These sudden pulses of radio waves come from far The peculiar signal is coming from a massive spiral galaxy 500 million light-years away. The source sends out one or two bursts of radio waves every

What the hell is it ? Scientists don’t know what to make of fast radio bursts. So, why is a radio signal repeating every 16 days like clockwork, and what can that teach us about its origins? FRBs come from all over space , not just from one particular region. Are we to assume that these aliens are

a man flying through the air on a snow board in the dark: Astronomers use radio telescopes like this one, part of the Very Large Array observatory in New Mexico, to listen to the cosmos. © Getty Images Astronomers use radio telescopes like this one, part of the Very Large Array observatory in New Mexico, to listen to the cosmos.

Fast radio bursts are one of astronomy’s tantalizing unsolved mysteries. These sudden pulses of radio waves come from far outside our galaxy. They last about a millisecond. And sometimes, the signals repeat.

Until recently, that’s about all scientists could tell you about fast radio bursts, or FRBs. Our radio telescopes — which pick up noise rather than light — first detected them in 2007, and since then we’ve recorded a few dozen more, but not enough to be able to put together a compelling theory of what causes them.

Sinn Fein have put me through hell, mother of murdered Paul Quinn says

  Sinn Fein have put me through hell, mother of murdered Paul Quinn says Breege Quinn’s son was attacked in Co Monaghan in the Irish Republic in 2007. After the murder, Sinn Fein powersharing minister Conor Murphy said Mr Quinn was a criminal. He has withdrawn the remarks and apologised to the family.Ms Quinn said: “He has … put our family through hell.”This is the message we will be giving to politicians today.I hope they listen, I hope Conor Murphy is listening so that we can move our attention back to the men who killed our Paul and who are walking freely around #Cullyhanna and #Crossmaglen while our son is in the ground.

It appears to be transmitting signals that reach Earth in a repeating, 16 - day pattern, but researchers have no idea why. According to a recent study, this marks the first time astronomers have detected a reliable pattern in the signals , known as fast radio bursts, or FRBs. It 's an important step in figuring

A strange radio signal from space was just discovered and it 's unlike any seen before. It 's not random and is repeating the same signal every 16 days .

With the origin of these signals still unknown, some scientists — notably the chair of the Harvard astronomy department, Avi Loeb — speculate aliens could be sending them.

In pictures: Famous milestones in space

Now, researchers based in Canada, where a radio telescope exceptionally well equipped to detect FRBs began operating in 2018, have added a new piece to the puzzle. A few previously detected FRBs had been shown to repeat sporadically, without any regular pattern. But by observing the sky from September 2018 through October 2019, the researchers in Canada found 28 bursts — including one that repeats with a very regular pattern indeed: It appears every 16.35 days, to be exact.

This is the first time scientists have detected such a pattern in an FRB source. The peculiar signal is coming from a massive spiral galaxy 500 million light-years away. The source sends out one or two bursts of radio waves every hour, over four days. Then it goes quiet for 12 days. Then the whole process repeats.

So, why is a radio signal repeating every 16 days like clockwork, and what can that teach us about its origins?

That’s the central question of a new paper authored by the Canadian Hydrogen Intensity Mapping Experiment in collaboration with the Fast Radio Burst Project (CHIME/FRB).

Gallery: The most stunning space photos ever

There are a couple of things we know for sure. The 16-day “periodicity” cannot be occurring “by chance coincidence,” the scientists write, and it’s “an important clue to the nature of the object.” It’s clear that the FRB can’t be originating from a cataclysmic event, like a star going supernova, since that’s a one-time affair.

But beyond that, the scientists really aren’t sure. They propose a few possibilities.

One explanation is orbital motion. Celestial bodies are known to orbit on regular timescales, so a pair of objects — like a star and a black hole — could account for the 16-day pattern. “Given the source’s location in the outskirts of a massive spiral galaxy,” the paper says, “a supermassive black hole companion seems unlikely, although lower-mass black holes are viable.”

The authors say FRBs could be generated if giant radio pulses from an energetic neutron star are eclipsed by a companion object. They also note that periodicity could arise from the rotation of a star, but that’s a tricky hypothesis: Previously observed sources have had way shorter periodicities (a few hours, not a couple of weeks) and way less strength (we’re talking nine orders of magnitude less) than FRBs have.

Gallery: Where Nasa plans to look for aliens (Business Insider)

    The future lander could search deep ice for signs of life in the    ocean below, digging 4 inches below Europa's surface to extract    samples for analysis in a mini, on-the-go laboratory.

In short, the authors don’t know what’s causing FRBs. But aliens are not on their list of possibilities. They end their paper calling for more research.

Are aliens causing fast radio bursts? Probably not.

While grounded speculation among astrophysicists suggests that FRBs are caused by neutron stars, stars merging, or black holes, it’s a different theory that has caught hold of the public imagination: maybe they’re caused by intelligent alien life.

A study by Avi Loeb and Manasvi Lingam of Harvard University, published in 2017, argued that the patterns could plausibly result from extraterrestrials’ transmitters. The paper is theoretical; it doesn’t propose any evidence for the “aliens” hypothesis, it just argues that it’d be compatible with the recorded data so far. They concluded it’d be physically possible to build such a transmitter — if you had a solar-powered, water-cooled device twice the size of the Earth.

The hypothesis raises some obvious questions. FRBs come from all over space, not just from one particular region. Are we to assume that these aliens are sophisticated enough to have spread across many galaxies, but that there are no signs of them other than these energy bursts? Or that many civilizations independently settled on the same odd style of energy burst?

The 2017 paper argues for the latter possibility: that many civilizations have separately built such massive transmitters and are sending out FRBs. “The latest estimates suggest that there are ∼ 10^4 [10,000] FRBs per day,” the paper observes, which would suggest an implausible number of extremely busy, scattered alien civilizations. To resolve that, the paper argues that perhaps “not all FRBs have an artificial origin — only a fraction of them could correspond to alien activity.”

But once we concede that FRBs can occur naturally, and conclude that at least some of them are occurring naturally, why conclude that any of them are artificial?

And if a civilization had the astounding technical capacities to build solar-powered, planet-sized transmitters, wouldn’t it be doing other things we could detect, and which were less ambiguous?

“The possibility that FRBs are produced by extragalactic civilizations is more speculative than an astrophysical origin,” the paper concedes.

Indeed, that’s what the CHIME/FRB researchers behind the new paper think. “We conclude that the periodicity [of the FRB] is significant and astrophysical in origin.”

The broader debate over alien life

Scientists disagree about how to interpret phenomena like FRBs in large part because they disagree about how plausible alien life is in the first place. In statistical terms, they have different priors, meaning that the background assumptions they are using to interpret the new evidence are different.

From one perspective, the universe is astonishingly large, full of habitable planets like Earth where life could evolve as it did here. Sometimes, that life would become intelligent. We’d expect such a universe to have lots of flourishing civilizations — as well as lots of extinct ones.

This is clearly the expectation that motivates Harvard’s Loeb. “As soon as we leave the solar system, I believe we will see a great deal of traffic out there,” he said in a 2019 interview with Haaretz. “Possibly we’ll get a message that says, ‘Welcome to the interstellar club.’ Or we’ll discover multiple dead civilizations — that is, we’ll find their remains.”

If you think that space is teeming with aliens, it’s not so much of a stretch to interpret astronomical phenomena as remnants of those aliens.

But if you’re looking at the same data with the expectation that we’re alone in the universe, you’re much likelier to conclude that there’s a natural explanation for FRBs.

It’s weird, given that the universe is so vast, that we seem to be alone in it. Physicist Enrico Fermi was the first to spell out this dilemma, and it’s named after him: the Fermi paradox. The paradox is that, under some reasonable assumptions about how often life originates and reaches technological sophistication, we should be able to detect signs of thousands or millions of other civilizations. And yet we haven’t. Recent investigations suggest that the paradox may have a mundane resolution — under more accurate assumptions about how life originates, we are very plausibly, alone.

The disagreement between researchers who think that advanced civilizations must be extremely rare, and those who think that they’re common, is a fairly substantive one. For one thing, if advanced civilizations are common, then why can’t we see them? We might be forced to conclude that they’re fairly short-lived. That’s Loeb’s take: “The technological window of opportunity might be very small,” he told Haaretz.

That take would have some consequences for us. If there’s some danger ahead that destroys every technological civilization that runs into it, we might expect that we’re living in a “vulnerable world” where future technological advances will destroy us, too.

In that way, disagreements over aliens have big implications. But that’s probably not the reason everyone cares about them. Offhand speculation about aliens tends to get vastly more coverage than anything else in astronomy. Whether we’re alone in the universe feels like a profoundly important question, for its implications for human civilization but also for its own sake. The lack of evidence suggesting phenomena like FRBs are alien in origin won’t be enough to stop people from wondering.

British scientist says it is 'almost a racing certain' that the icy seas on Jupiter's moon Europa are home to alien life that are 'octopus-like creatures' .
Monica Grady, a British space scientist, says it is 'almost a racing certain' that Jupiter's moon Europa is harboring to alien life in its icy seas, but believes they are 'octopus' like creatures.A British space scientist says it is 'almost a racing certain' that Jupiter's moon Europa is home to alien life, but believes they are 'octopus' like creatures.

—   Share news in the SOC. Networks

Topical videos:

usr: 1
This is interesting!