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Questions tagged [seti]

Search for Extraterrestrial Intelligence, an organization that scans the sky for signs of non-human technology. Study has focused on analysis of the radio spectrum of other stars, but also involves other approaches.

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149 views

Could the sun be used as a super-amplifier for SETI transmissions? [closed]

I just want to know if there is any scientific merit to this, the premise of Cixen Liu's novel, "The Three-Body Problem". English translation published in 2016. See also Tor.com: Cixin Liu’s Award-...
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1answer
107 views

Likelihood of Neighbor close enough to detect

Not sure if this is the correct site on Stack Exchange to ask this, please let me know if there is a better one. If civilizations were distributed fairly evenly in the habitable region of the galaxy, ...
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5answers
3k views

Why aren't we using neutrino emissions to detect alien civilizations?

Current SETI efforts seem to focus on the electromagnetic spectrum in the "water hole," or EM waves between 1420 MHz and 1720 MHz since that's the resonant frequency of hydrogen atoms up to water ...
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1answer
180 views

Why were Sónar Calling GJ273b messages called secret?

Sónar Calling GJ273b is in the news, at the time of this question, for sending messages into space in an attempt to contact aliens. Some news sites are calling the messages "secret". Does anyone know ...
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1answer
125 views

Does SETI perform search of extremely low bandwidth signals?

Sending a signal at interstellar distance requires enormous power - something of order not too far from energies of the stars. Even if we harness the power of stars, modulating that signal would take ...
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1answer
169 views

Why is SETI searching for unusual signal patterns, and not higher levels of randomness than found in background radiation?

Maybe this is a (very) stupid question, but anyways, I was wondering about that lately just for fun. So SETI is basically searching (among all the noise coming to use from space) unusual (repeatable) ...
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1answer
252 views

Why are messages to space constructed as pictograms?

The Arecibo message and both forms of the Dumas-Dutil message are constructed exclusively as pictograms. They are sequences of bits, grouped into "pages" which when viewed as black or white pixels, ...
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Frequency progressive signals vs time progressive signals?

I am not very experienced with signals, but something that has occurred to me while reading on various ways we are searching for ET signals, is that it seems most people rule out a signal unless it's ...
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1answer
221 views

Is SETI a waste of time? [closed]

If the cosmic speed limit of electromagnetic waves is $c$ then is there any reason to use this to communicate as over long (interstellar) distances? Can this be an effective means of communication? ...
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0answers
218 views

Was it a “Soviet military satellite not in any of the catalogs?”

I can't connect to the Tass news item directly http://tass.com/science/896683 but on a SETI page an item dated August 31, 2016 says: An article that quotes the Russian news agency TASS is ...
6
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2answers
516 views

What is the protocol surrounding public disclosure of a message of extra-terrestrial origin?

SETI is listening for messages of extra-terrestrial origin. This article talks about a candidate signal Russian astronomers received over a year ago but that only recently came to light. There was no ...
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0answers
908 views

From how far away could our SETI searches detect and recognize our technological signals?

If we imagine an extra-terrestrial civilization which is on an exact technological par with Earth, and has been leaking radio signals into space exactly the way we have been doing, how far away can it ...
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2answers
964 views

Could cosmic rays be produced by alien propulsion systems?

Could the cosmic radiation of heavy ions which hit us be the exhaust of advanced electric propulsion used by alien space travelers? While supernovae seem to cause part of them, much of it is far from ...
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1answer
201 views

Has Alpha Centauri been a subject for SETI activities?

There is a claim that habitable-zone orbits are stable around both components of the Alpha Centauri binary, and at least one planet has been detected (though not in the habitable zone). Both stars ...
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2answers
323 views

How to construct a message to send to the stars?

There have been a few attempts to transmit messages to the stars with the assumption that there may be extraterrestrial civilizations somewhere out there to receive them. These messages (such as the ...
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2answers
1k views

Could we detect a nuclear explosion near Proxima Centauri?

How big would a nuclear explosion in open space around 1 AU from Proxima Centauri have to be for it to be detectable with current technology? Assume best-case scenarios, such as we're specifically ...
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2answers
481 views

How far can SETI's ear listen?

With the current infrastructure available to SETI, how distant would it be feasible to pick up routine radio communications and noise from a planet emitting radio with identical power and signal ...
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1answer
222 views

Is there good estimates/measures on the variables that make up the Fermi paradox?

Here's what I've got: Universe size: Milky way is 100,000 LY wide. Nearest galaxy is 2.2m LY away. Number of stars: about 300,000,000,000 in the Milky way. 100,000,000,000 galaxies. Age of ...
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4answers
1k views

Is a combination of 'space is big' and 'humans haven't been around long' a good solution to the Fermi paradox?

The Fermi paradox is basically that: There are billions of stars, life is probably abundant throughout the universe. Even though it may take tens of thousands or millions of years for life on other ...
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2answers
546 views

Could unexpectedly high levels of interstellar space debris be the Great Filter?

I've heard (though I can't find the source) that sufficiently large interstellar space debris has the potential to destroy spacecraft, and that there is considerable uncertainty about how much of a ...
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4answers
605 views

Are we searching for life “as we don't know it”?

The phrase "Life as we know it" is often spoken with a knowing wink, and implies the speaker is in on the big secret. Life on Earth is carbon based and every form of life we know of is on Earth. Which ...
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3answers
366 views

Does man send any signal to attract aliens?

Does man send any signal (such as electromagnetic radiation) to space to attract aliens?
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4answers
302 views

What exactly do they look for when searching for extraterrestrial intelligence?

There are some experiments and projects that are searching for extraterrestrial intelligence.(SETI) I want to know what signs exactly are they looking for? Do they just look for monotone sinusoidal ...