1. Why no alien has listened to us till date

Why no alien has listened to us till date

Why have we not received any call from the aliens out there yet? What if extraterrestrial observers called but nobody on Earth heard? As scientists step up their search for other life in the universe, two astrophysicists from McMaster University are proposing a way to make sure we don't miss the signal if extraterrestrial observers try to contact us first.

By: | Published: March 2, 2016 7:17 PM

Why have we not received any call from the aliens out there yet? What if extraterrestrial observers called but nobody on Earth heard? As scientists step up their search for other life in the universe, two astrophysicists from McMaster University are proposing a way to make sure we don’t miss the signal if extraterrestrial observers try to contact us first.

According to Rene Heller and Ralph Pudritz, the best chance for us to find a signal from beyond is to presume that extraterrestrial observers are using the same methods to search for us that we are using to search for life beyond Earth.

Here on Earth, space researchers are focusing most of their search efforts on planets and moons that are too far away to see directly.

Instead, they study them by tracking their shadows as they pass in front of their own host stars.

Measuring the dimming of starlight as a planet crosses the face of its star during orbit, scientists can collect a wealth of information, even without ever seeing those worlds directly.

Using methods that allow them to estimate the average stellar illumination and temperatures on their surfaces, scientists have already identified dozens of locations where life could potentially exist.

In a paper forthcoming in the journal Astrobiology, Heller and Pudritz turn the telescope around to ask what if extraterrestrial observers discover Earth as it transits the sun?

If such observers are using the same search methods that scientists are using on Earth, the researchers propose that humanity should turn its collective ear to Earth’s “transit zone” – the thin slice of space from which our planet’s passage in front of the Sun can be detected.

“It’s impossible to predict whether extraterrestrials use the same observational techniques as we do,” said Heller. “But they will have to deal with the same physical principles as we do, and Earth’s solar transits are an obvious method to detect us.”

The transit zone is rich in host stars for planetary systems, offering approximately 100,000 potential targets, each potentially orbited by habitable planets and moons.

“If any of these planets host intelligent observers, they could have identified Earth as a habitable, even as a living world long ago and we could be receiving their broadcasts today,” Heller and Pudritz wrote.

The question of contact with others beyond Earth is hardly hypothetical as several projects are under way, both to send signals from Earth and to search for signals that have been sent directly or have “leaked” around obstacles, possibly travelling for thousands of years.

Heller and Pudritz propose that the “Breakthrough Listen Initiative”, part of the most comprehensive search for extraterrestrial life ever conducted, can maximise its chances of success by concentrating its search on Earth’s transit zone.

Tags: AliensEarth
  1. A
    Adarsha Rao
    Mar 3, 2016 at 9:34 am
    How dumb, if they are using same methods as us, then they would be in listen mode when earth is in transit mode. If we also turn our 'collective ear', then both of us would be listening and no one talking !!
    Reply
    1. D
      David Hedrick
      Mar 3, 2016 at 3:07 pm
      The entire premise for this idea that aliens must exist is based on a set of umptions that have never been proven. In the equation to determine the probability of intelligent life evolving, what exactly is the coefficient for the likelihood that life will evolve on a certain planet, and what is the graph of data sets showing how this number is calculated, either through interpolation or extrapolation? Obviously extrapolation given the shortage of data. It's all the musings of some science geek jerking off his imaginary intelligence? We have exactly a data set consisting of one solar system. That is one! Exactly one, not 1.1, not 1.5, not 1,00,000,000, just one. How you try to draw conclusions of probability from a test group of one is a mind boggling jump of pure faith and hope, there is no science in it. You could easily come to the conclusion that because life evolved on this one planet that is the only one in the "goldilocks" zone, that there is 100% certainty that intelligent life will evolve on EVERY planet where there are similar conditions. And that's exactly what they have done. Well, Mars has proved you wrong. Meanwhile bacteria growing on earth lives in conditions even worse than Mars'. Then there's the water bear, able to survive in space, why is something like that not living on the moon? On Mars? On Venus, Jupiter, or any other planet? Anywhere there is water that even for fleeting moments is liquid, there should be life, even outside what is perceived to be the Goldilocks zone. Not to mention life based on substances for which we have not imagined such systems. Suddenly the Goldilocks zone has expanded, but there is no life there when we look, and yet no adjustment to the coefficient to accommodate real data that shows that though life is much more resilient and adaptable than previously thought, it is not actually where it should be predicted by this theory. There continues to be absolutely no evidence of life of any kind anywhere except here. The coefficient for probability of evolution must be adjusted so low, in fact, that it approaches negative infinity, making the possibility of life evolving anywhere exactly 0, except for the umption that there are an infinite number of solar systems and planets, which balances out to be approximately... undefined. 0/0= whatever the interpreter wants it to be. A number divided by itself =1 n/0= infinity 0/n = 0 Division by 0 is not defined, or empty set. Infinity divided by any number is infinity Any number divided by infinity approaches 0 It's all a mess of speculation, and there are so many pitfalls in trying to "calculate" probability of extra terrestrial life and intelligence I would call it something else besides calculating or science, like "speculative ion'. This is religion, not science, when you ignore facts and evidence but stick to a theory as if it were a law. Faith, hope, prayer; these are the tools of Alien scientists. AKA Fools.
      Reply
      1. D
        David Hedrick
        Mar 3, 2016 at 6:22 pm
        The entire premise for this idea that aliens must exist is based on a set of umptions that have never been proven. In the equation to determine the probability of intelligent life evolving, what exactly is the coefficient for the likelihood that life will evolve on a certain planet, and what is the graph of data sets showing how this number is calculated, either through interpolation or extrapolation? Obviously extrapolation given the shortage of data. It's all the musings of some science geek joiking off his imaginary intelligence? We have a data set consisting of one solar system. That is one! Exactly one, not 1.1, not 1.5, not 1,00,000,000, just one. How you try to draw conclusions of probability from a test group of one is a mind boggling jump of pure faith and hope, there is no science in it. You could easily come to the conclusion that because life evolved on this one planet that is the only one in the "goldilocks" zone, that there is 100% certainty that intelligent life will evolve on EVERY planet where there are similar conditions. And that's exactly what they have done. Well, Mars has proved you wrong. Meanwhile bacteria growing on earth lives in conditions even worse than Mars'. Then there's the water bear, able to survive in space, why is something like that not living on the moon? On Mars? On Venus, Jupiter, or any other planet? Anywhere there is water that even for fleeting moments as liquid, there should be life, even outside what is perceived to be the Goldilocks zone. Not to mention life based on substances for which we have not imagined such systems. Suddenly the Goldilocks zone has expanded, but there is no life there when we look, and yet no adjustment to the coefficient to accommodate real data that shows that though life is much more resilient and adaptable than previously thought, it is not actually where it should be predicted by this theory. There continues to be absolutely no evidence of life of any kind anywhere except here. The coefficient for probability of evolution must be adjusted so low, in fact, that it approaches negative infinity, making the possibility of life evolving anywhere exactly 0, except for the umption that there are an infinite number of solar systems and planets, which balances out to be approximately... undefined. 0/0= whatever the interpreter wants it to be. A number divided by itself =1 n/0= infinity 0/n = 0 Division by 0 is not defined, or empty set. Infinity divided by any number is infinity Any number divided by infinity approaches 0 It's all a mess of speculation, and there are so many pitfalls in trying to "calculate" probability of extra terrestrial life and intelligence I would call it something else besides calculating or science, like "speculative self mind fondling'. This is religion, not science, when you ignore facts and evidence but stick to a theory as if it were a law. Faith, hope, prayer; these are the tools of Alien scientists. AKA Fools.
        Reply
        1. L
          LH
          Mar 3, 2016 at 2:47 pm
          Except that our electronic signals dis and blend in with background cosmic radiation in less than a light year. So all anyone would be able to tell is that Earth is habitable, but not that there is a technological civilization here. And turning that on its head, we do not have the capability to find civilizations equal to us, because their electronic signals are undetectable too. There is a possibility we could detect an advanced civilization which uses more powerful signals, but as Snowden has suggested, those signals would likely be encrypted and so also otherwise impossible to distinguish from background noise.
          Reply
          1. J
            Josh
            Mar 3, 2016 at 4:41 pm
            Hardly hypothetical? It's ENTIRELY hypothetical. 40 years of looking,billions spent without a hint..not a whisper. .nothing..what a waste..
            Reply
            1. R
              RosscoInOshawa
              Mar 3, 2016 at 4:50 pm
              Does it really matter anyway? We can peer out into the vastness of space but what we are seeing is likely millions if not billions of years old and long ago dead. Likely enough time for the distant colony to have destro itself much like we are doing here on earth. EM radiation such as radio and television signals are no better and anything within 'earshot' and within a reasonable time to travel to or from has not responded to our plea's for contact. Give it a rest. Spend that money on more relevant and important things. Anybody or anything STUPID enough to contact us will do so if it/they chooses. I don't blame them for avoiding us.
              Reply
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