For decades, Robert Gray has been trying to duplicate the most surprising and still-unexplained observation in the history of the search for extraterrestrial life.
Late one night in the summer of 1977, a large radio telescope outside Delaware, Ohio intercepted a radio signal that seemed for a brief time like it might change the course of human history. The telescope was searching the sky on behalf of SETI, the Search for Extraterrestrial Intelligence, and the signal, though it lasted only seventy-two seconds, fit the profile of a message beamed from another world. Despite its potential import, several days went by before Jerry Ehman, a project scientist for SETI, noticed the data. He was flipping through the computer printouts generated by the telescope when he noticed a string of letters within a long sequence of low numbers---ones, twos, threes and fours. The low numbers represent background noise, the low hum of an ordinary signal. As the telescope swept across the sky, it momentarily landed on something quite extraordinary, causing the signal to surge and the computer to shift from numbers to letters and then keep climbing all the way up to "U," which represented a signal thirty times higher than the background noise level. Seeing the consecutive letters, the mark of something strange or even alien, Ehman circled them in red ink and wrote "Wow!" thus christening the most famous and tantalizing signal of SETI's short history: The "Wow!" signal.
Despite several decades of searching, by amateur and professional astronomers alike, the "Wow!" signal has never again been found. In his new book, The Elusive Wow, amateur astronomer Robert Gray tells the story of the "Wow!" signal, and of astronomy's quest to solve the puzzle of its origin. It's a story he is well-positioned to tell. That's because Gray has been the "Wow!" signal's most devoted seeker and chronicler, having traveled to the very ends of the earth in search of it. Gray has even co-authored several scientific articles about the "Wow!" signal, including a paper detailing his use of the Very Large Array Radio Observatory in New Mexico to search for it. I spoke with Gray about the "Wow!" signal, radio telescopes, and the economics of prospective extraterrestrial civilizations.
From a technical standpoint, what makes the "Wow!" signal so extraordinary?
Gray: The main thing is the profile of the signal, the way it rises and falls over about seventy-two seconds. When we point these big dish antennas up at the sky, and a radio source moves across them, they have a special signature, a kind of fingerprint. That fingerprint results from the "loudness" of the radio source slowly increasing, getting to a peak as the dish points straight at it, and then slowly decreasing as the object moves across the dish and past its beam of observation. In the case of the "Wow!" signal, the signal followed that curve perfectly. It looked exactly like a radio signal in the sky would look, and it's pretty unlikely that anything else---like an airplane or satellite or what have you---would leave a special signature like that.
Also there's not much doubt that the "Wow!" signal was a radio signal, rather than something from a natural source like a quasar. That's because Ohio State was using a receiver with fifty channels, which is sort of like having fifty AM radios, each tuned to adjacent stations. With the "Wow!" there wasn't any noise on any of the channels except for one, and that's just not the way natural radio sources work. Natural radio sources diffuse static across all frequencies, rather than hitting at a single frequency. So it's pretty clear that this was a radio signal and not a quasar or pulsar or some other natural radio source, of which there are millions. It was very narrow band, very concentrated, exactly like a radio station, or a broadcast, from another world would look.
The "Wow!" signal turned up very close to the frequency at which hydrogen glows. Why is that significant?
Gray: Well there's a little history there. In the early sixties when people started thinking about the possibility of detecting extraterrestrial broadcasts with radio telescopes, one of the first frequencies suggested was the frequency that interstellar hydrogen glows at. At the time, it was one of the few interstellar emission lines that was known, and a lot of radio observatories had a receiver that could pick it up so it was especially convenient to look for broadcasts there. If you imagine that there are all of these radio astronomers around the universe looking at the stars with big antennas, which is what you need to pick up a signal from that far, chances are that they too would be listening at the frequency of hydrogen, because there is so much of it around. It's the wave you can use to map the gas in galaxies, so it's a natural "channel" for astronomers to look at. There weren't a lot of frequencies that had that natural characteristic. So in the early decades of SETI, that's the frequency that most people chose to listen at.
By the way, not everybody agrees with this strategy now. A lot of new emission lines have been found, and so the current best practice is to listen to millions of frequencies at a time so you don't have to guess which one ET might favor. And that's exactly what NASA's SETI project tried to do, and that's what the Allen Telescope Array at U.C. Berkeley is trying to do. But it just so happened that the Ohio State people were using the hydrogen strategy when they found this thing, and, it just so happens that the "Wow!" signal was fairly close to where Hydrogen was dwelling. So if you believe the magic frequency strategy, that extraterrestrials would necessarily broadcast in the Hydrogen frequency, then the "Wow!" signal sort of fits that.
The Very Large Array in New Mexico
Is it possible that the "Wow!" signal is somehow a computer glitch, or a signal from earth that was reflected off of space debris of some sort?
Gray: Of course it's possible. It could have been any number of things. However, it almost certainly wasn't a computer glitch, because it showed this rise and fall of intensity that's just exactly what a radio source from the sky would look like. Also, the Ohio State radio telescope was cleverly rigged to filter out local stuff.
The only thing that conceivably could have made that special signature is a satellite of some sort at just the right distance, going just the right speed, in order to mimic a celestial object traversing the sky. So that's a possibility, but it seems pretty unlikely for a number of reasons. First, it would have been seen by a lot of people. Ohio State would have seen it repeatedly, because satellites broadcast repeatedly. Secondly, if it was a secret satellite it would have been pretty stupid to broadcast at a frequency that radio astronomers across the world listen to.
For a long time, Jerry Ehman, who actually scribbled "Wow!" on the original computer printout, considered the possibility that it was a piece of space debris reflecting a signal from the earth back down into the antenna. But he no longer believes that to be the case. And I'm not saying that it definitely was an extraterrestrial broadcast; there's no proof of that. The best way I can think to analogize this thing is to say that it was a tug on the cosmic fishing line. It doesn't prove that you have a fish on the line, but it does suggest that you keep your line in the water at that spot.
Some have suggested that if the "Wow!"
signal was alien in origin, then perhaps it sweeps around its home
planet or star, the way light does from a lighthouse, which would
explain why it hasn't yet reappeared. Do you think that's plausible?
That's my favorite theory. And it's just an idea of course. But when
you step back from all of this a little bit, you notice that almost all
searches for extraterrestrial intelligence have been surveys that look
at all of these different spots in the sky for just a few minutes at a
time. And the assumption such searches operate on is that there is a
beacon, or a broadcast of some sort, that is on all the time, and so all
you have to do is survey the sky and if it's there you'll find it. It's
the easiest method, and it's the right thing to do when you're first
But if you look at this in a
deeper way, and you calculate the kind of energy it would take to
operate a beacon that is on all the time, broadcasting in all
directions, strong enough so you could pick it up from many, many light
years away, the amount of power is enormous. It's in the range of
thousands and thousands of big power plants. We humans certainly
couldn't do something like that now. So to have a signal that's always
there, you have to assume a very advanced intelligence, and you have to
assume that it's highly motivated to talk to us, and neither of those
things may be true of a broadcaster. They might not be so rich, or
profligate with their energy, or, for that matter, very interested in
talking. They might use some other cheaper strategy---brief periodic
broadcasting, a sweeping lighthouse beam, or other methods.
you may know, there's another thrust in SETI, which has become the
focus of a lot of people's interest over the past ten years and that's
optical SETI, where you look at starlight and see if you find any
sudden, brief, flashes of light that are much stronger than what the
star normally puts out. The idea is that you might find
extraterrestrials communicating by shining a giant laser at us, and it's
an idea that's become quite popular. But as with most SETI projects,
they're simply scanning the sky, looking at each spot for roughly a
minute. And at the end of a couple of years they can tell you they've
looked at every spot in the sky and they didn't see any flashes, but of
course there you have the same problem as you do with radio surveys. You
look in every direction, but you only do it for a couple of minutes,
and so if anyone were broadcasting with the lighthouse method, you'd be
unlikely to find them.
Did the "Wow!" signal come from a particular star or group of stars?
Gray: That's a good question, and the short answer is that there's no way to tell.
Even though the Ohio State radio telescope is really big, it looks at a rather large spot in the sky---a spot shaped like an ellipse that's taller than the moon and about a quarter as wide. In a spot of that size, you have literally millions of stars. I've looked at the photographs for that area of the sky, and there are tons of stars there---no particularly intriguing star that stands out as being a likely source of the signal. Now, several years later I looked for the signal with the Very Large Array in New Mexico. Unlike some of the older telescopes it can give you a pretty good radio image of the sky, because its various telescopes make up one giant antenna that's twenty miles across. And it gives you pretty good resolution, so if you'd seen the "Wow!" with the VLA you really could tell which star a radio signal would have come from.
The Mount Pleasant Radio Observatory in Tasmania
What was it like working with the Very Large Array in New Mexico? Did you get a thrill out of that?
Gray: I did. The Very Large Array was, until the end of the twentieth century, the largest radio telescope ever built. It's the same array of antennas featured in the film Contact. It's an unbelievable machine. It can take pictures of the radio sky with the same resolution as an optical telescope, allowing you to see literally millions of objects across the sky. Most of them are distant galaxies with wild things going on at their core, most likely having to do with black holes.
Getting to use the Very Large Array to look for the 'Wow!" was very unexpected. As far as I can tell, no amateur astronomer had ever done it. Nobody had ever used the full array to look for an extraterrestrial signal at all. It's funny when you show up, they give you a rundown of all the technical stuff, but they also give you a brochure on how to survive rattlesnake bites, because if you go wandering into the desert out there you might get bitten.
But it's a credit to Big Science that they let me use the Very Large Array to look for the "Wow!" signal. I wouldn't have expected it, and it suggests that Big Science, as an enterprise, isn't quite as ivory tower or exclusive as you might think.
You're coming at this as from the field of data analysis, rather than as a professional astronomer, do you think you brought a
special skill set to this problem? Were there any insights you had that might
not have been as intuitive to an astronomer?
astronomers generally look at things like stars, things that aren't quite
eternal, but that last for a really long time. As a result some astronomers may
bring a certain expectation to a radio signal, an expectation that it's going
to be there all the time. The people who do SETI, who are often but not always
astronomers, have a mindset that it's sensible to look for the really strong
signal that is going to be there all of the time.
Because my education is not in astronomy or engineering, it may be that I bring a kind of practicality to this, especially as it concerns the
practicality and economics of what it takes to broadcast a signal like that. Broadcasters, just like those of us who are listening, might not be able to command enormous
resources, they might not be in charge of whatever political systems are
responsible for distributing resources to science in their little corner of the universe. And so as a result they might be forced to use signals that are not present all of the time and therefore those signals may be difficult to find.
The other thing is: Over the years I've talked to a lot of
astronomers and a lot of people involved with SETI, and whenever the topic of the
"Wow!" comes up, they seem to believe that everybody has looked for
it, that it's been checked out. But I've never been able to find anyone else who looked for it. In fact, nobody other than Ohio
State seemed all that interested in trying to confirm it at all. Now
fortunately that created a situation where I was able to convince several
scientists to help me look for it, using various kinds of radio telescopes,
including the Very Large Array, the Mount Pleasant Radio Observatory in Tasmania, and the small one that I built myself. So it's
possible that what I bring to this is simply the willingness to go out and
In a hundred years from now it's likely that we won't be
limited to these giant dish things that stare at the sky and only see one
little spot. It's possible that there will be some sort of technology that can
look at the whole sky at the same time, with the same sensitivity as you get
with a big dish, and perhaps, when we look, at some interval we'll see a flash, a
signal, and maybe that's the way we'll find broadcasters, if any are out
there. But in the meantime, you know, you have to keep a line in
The social network learns more about its users than they might realize.
Facebook, you may have noticed, turned into a rainbow-drenched spectacle following the Supreme Court’s decision Friday that same-sex marriage is a Constitutional right.
By overlaying their profile photos with a rainbow filter, Facebook users began celebrating in a way we haven't seen since March 2013, when 3 million peoplechanged their profile images to a red equals sign—the logo of the Human Rights Campaign—as a way to support marriage equality. This time, Facebook provided a simple way to turn profile photos rainbow-colored. More than 1 million people changed their profile in the first few hours, according to the Facebook spokesperson William Nevius, and the number continues to grow.
“This is probably a Facebook experiment!” joked the MIT network scientist Cesar Hidalgo on Facebook yesterday. “This is one Facebook study I want to be included in!” wrote Stacy Blasiola, a communications Ph.D. candidate at the University of Illinois, when she changed her profile.
Over the last two weeks, Republican presidential candidates have repeatedly missed opportunities to demonstrate that they care about communities outside of their traditional base.
After Mitt Romney’s defeat in 2012, the Republican National Committee published an “autopsy.” “When it comes to social issues,” the autopsy declared, “the Party must in fact and deed be inclusive and welcoming. If we are not, we will limit our ability to attract young people.” The autopsy also added that, “we need to go to communities where Republicans do not normally go to listen and make our case. We need to campaign among Hispanic, black, Asian, and gay Americans and demonstrate we care about them, too.”
The last two weeks, more than any since Romney’s defeat, illustrate how miserably the GOP has failed.
Start with June 17, when Dylann Roof, a young white man enamored of the Confederate flag, murdered nine African Americans in church. Within three days, Romney had called for the Confederate flag’s removal from South Carolina’s capitol. Four days later, the state’s Republican governor and senators called for its removal too. But during that entire week—even as it became obvious that the politics of the flag were shifting—not a single GOP presidential candidate forthrightly called for it to be taken down. Instead, they mostly called it a state decision, a transparent dodge politicians deploy when they don’t want to make a difficult call.
For centuries, experts have predicted that machines would make workers obsolete. That moment may finally be arriving. Could that be a good thing?
1. Youngstown, U.S.A.
The end of work is still just a futuristic concept for most of the United States, but it is something like a moment in history for Youngstown, Ohio, one its residents can cite with precision: September 19, 1977.
For much of the 20th century, Youngstown’s steel mills delivered such great prosperity that the city was a model of the American dream, boasting a median income and a homeownership rate that were among the nation’s highest. But as manufacturing shifted abroad after World War II, Youngstown steel suffered, and on that gray September afternoon in 1977, Youngstown Sheet and Tube announced the shuttering of its Campbell Works mill. Within five years, the city lost 50,000 jobs and $1.3 billion in manufacturing wages. The effect was so severe that a term was coined to describe the fallout: regional depression.
Tuesday is the official deadline for the Greek government to either make a deal with debtors or face default and its consequences.
Reuters is reporting a new rescue proposal from Tsipras’ office that has just been submitted to Greece’s creditors. The statement from Tsipras said that the Greek government wants a new two-year deal under the European Stability Mechanism program, a move some are calling a third bailout. The late breaking request asks for debt restructuring, and would tap into the ESM—which has a €500 billion lending capacity. It’s unclear how Greece’s creditors will react, although Germany’s chancellor Angela Merkel hasn’t yet given any hope in the matter.
After the largest decline of 2015, U.S. stocks pushed higher on Tuesday with both the Dow and S&P up by about 0.50 percent just after the market’s opening. The optimistic performance follows a strong rebound in Asian markets overnight.
The second episode of the new season was a slow burner with a dramatic twist.
Let’s start at the beginning, with Frank in bed with his wife, Jordan, discussing water stains on the ceiling and childhood entombments. I don’t know about you guys, but I found this whole bit slack and familiar. Maybe there was a two-minute scene in there, but five? Maybe a more charismatic actor could have pulled off that lengthy monologue. But Vince Vaughn is no Robert Shaw, and his childhood basement is no U.S.S. Indianapolis.
The Islamic State is no mere collection of psychopaths. It is a religious group with carefully considered beliefs, among them that it is a key agent of the coming apocalypse. Here’s what that means for its strategy—and for how to stop it.
What is the Islamic State?
Where did it come from, and what are its intentions? The simplicity of these questions can be deceiving, and few Western leaders seem to know the answers. In December, The New York Times published confidential comments by Major General Michael K. Nagata, the Special Operations commander for the United States in the Middle East, admitting that he had hardly begun figuring out the Islamic State’s appeal. “We have not defeated the idea,” he said. “We do not even understand the idea.” In the past year, President Obama has referred to the Islamic State, variously, as “not Islamic” and as al-Qaeda’s “jayvee team,” statements that reflected confusion about the group, and may have contributed to significant strategic errors.
The commonwealth is facing a serious debt crisis that could result in default, but that’s only part of the problem.
Puerto Rico is a small island with some big financial problems. Governor Alejandro Garcia Padilla recently told the New York Times that there was no way the island, which has been struggling with about $72 billion of debt, would be able to pay, and instead would try to work out new deals and deferred payments with some of its creditors. This, of course, has lead to fears that the commonwealth will default on its loans.
The admission that Puerto Rico’s finances are much worse than originally thought was spurred by areport commissioned by the Government Development Bank, an agency tasked with developing economic and financial strategies for the commonwealth, and conducted by current and former IMF staffers. The report, nicknamed The Krueger Plan for it’s lead author Anne Krueger, doesn’t mince words when it comes to the outlook for the debt-laden island: "Structural problems, economic shocks and weak public finances have yielded a decade of stagnation, outmigration and debt. Financial markets once looked past these realities but have since cut off the commonwealth from normal market access. A crisis looms.”
The historian and Knesset member Michael Oren accuses the president of distancing the U.S. from Israel, and calls out left-wing Jews and Israel’s Jewish critics in the American press.
In a recent post, I suggested that the intervention of two men, the former U.S. national security advisor Tom Donilon and the former Israeli ambassador to the United States, Michael Oren, might help improve the dysfunctional relationship between the Obama administration and the government of Israeli Prime Minister Benjamin Netanyahu.
At the time I wrote this, both men had reputations as people who were concerned about preserving the extraordinarily complicated, and extraordinarily close, U.S.-Israel relationship, and both had spent a good deal of time calming the waters between Obama and Netanyahu. Today, Donilon maintains that reputation. As for Oren …
Put it this way: If Goldblog readers would allow me to withdraw the suggestion, I’d be much obliged. Oren has created a new role for himself: acid critic of the Obama administration and of left-leaning American Jews (especially in the press and in the White House) who, he believes, are trading on their Jewishness when they criticize Israel. Oren’s critique, at its heart, is simple: Obama, in part because he wanted to reconcile the U.S. with the “Muslim world” (a very large, ill-defined, and politically complicated concept, in Oren’s mind), decided to distance the United States from Israel; to surprise Israel by altering U.S. Middle East policy without prior notice; and to negotiate with Israel’s most potent enemy without alerting Israeli leaders.
Throughout season three, the Netflix show has fashioned an unmistakeable philosophical thesis: All humankind is fundamentally flawed, but kindness can save us.
(Warning: There are spoilers ahead concerning plot points through the finale of season three.)
In season one of Orange Is the New Black, when an attempt to scare a group of wayward teens straight results in their derision, Piper tells one of them that the scariest thing about prison isn’t other people—it’s the fact that it forces you to come to terms with who you really are. Season three, which was released on Netflix earlier this month, has doubled down on this thesis in unexpected ways: Piper (Taylor Schilling), for example, has evolved from a naive yuppie into a cruel and manipulative businesswoman who exploits cheap labor via her used-panty business, while Pennsatucky (Taryn Manning), a lunatic who murdered a doctor and tried to kill Piper with a shiv in season one, is now one of the show’s most sympathetic characters.
In 1784, the doctor Benjamin Rush described alcohol as a threat to morality—and a danger to the nascent republic.
Go ahead, have a small beer; it will bring “Serenity of Mind, Reputation, Long Life, & Happiness.” Even a strong beer would be fine, for that brings “Cheerfulness, Strength, and Nourishment,” as long as it’s only sipped at meals. So declared Benjamin Rush, one of the signers of the Declaration of Independence and the early republic’s most prominent physician. In his loquaciously named pamphlet, An Inquiry Into the Effects of Ardent Spirits on the Human Mind and Body, first published in 1784, Rush describes the “usual” downward spiral of drink. What starts as water and wine quickly turns into punches and toddies and cordials, ending with a hopeless vortex of gin, brandy, and rum, “day and night.”* In the pits of intemperance, one can expect such vices as “Idleness, Gaming, peevishness, quarrelling, Fighting, Horse-Racing, Lying and Swearing, Stealing and Swindling, Perjury, Burglary, [and] Murder,” with punishments including “Black eyes and Bags,” “State prison for Life,” or, worst of all, “Gallows.”**