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Astrophysicist Believes Technologically-Advanced Species Extinguish Themselves (sciencedaily.com)
Why haven't we heard from intelligent life elsewhere in the universe? wisebabo writes:
In the Science Daily article "Where is everybody? The Implications of Cosmic Silence," the retired astrophysicist Daniel Whitmire explains that using the principle of mediocracy (a statistical notion that says, in the absence of more data, that your one data point is likely to be "average"), that not only are we the first intelligent life on earth but that we will likely be the only (and thus the last) intelligent life on this planet... Unfortunately that isn't the worst of it.
Coupled with the "Great Silence", it implies that the reason we haven't heard from anyone is that intelligent life, when it happens anywhere else in the universe, doesn't last and when it does it flames out quickly and takes the biosphere with it (preventing any other intelligent life from reappearing. Sorry dolphins!). While this is depressing in a very deep sense both cosmically (no Star Trek/Wars/Valerian universes filled with alien civilizations) and locally (we're going to wipe ourselves out, and soon) it is perhaps understandable given our current progress towards reproducing the conditions of the greatest extinction event in earth's history.
That last link (reprinting a New York Times opinion piece) cites the "Great Dying" of 90% of all land-based life in 252 million B.C., which is believed to have been triggered by "gigantic emissions of carbon dioxide from volcanoes that erupted across a vast swath of Siberia." But if we're not headed to the same inexorable doom, that raises an inevitable follow-up question.
If intelligence-driven extinction doesn't explain this great cosmic silence, then what does? Why hasn't our species heard from other intelligent civilizations elsewhere in the universe?
Coupled with the "Great Silence", it implies that the reason we haven't heard from anyone is that intelligent life, when it happens anywhere else in the universe, doesn't last and when it does it flames out quickly and takes the biosphere with it (preventing any other intelligent life from reappearing. Sorry dolphins!). While this is depressing in a very deep sense both cosmically (no Star Trek/Wars/Valerian universes filled with alien civilizations) and locally (we're going to wipe ourselves out, and soon) it is perhaps understandable given our current progress towards reproducing the conditions of the greatest extinction event in earth's history.
That last link (reprinting a New York Times opinion piece) cites the "Great Dying" of 90% of all land-based life in 252 million B.C., which is believed to have been triggered by "gigantic emissions of carbon dioxide from volcanoes that erupted across a vast swath of Siberia." But if we're not headed to the same inexorable doom, that raises an inevitable follow-up question.
If intelligence-driven extinction doesn't explain this great cosmic silence, then what does? Why hasn't our species heard from other intelligent civilizations elsewhere in the universe?
You find a nice writeup about the Cosmic Silence and possible reasons for that in Stanislaw Lem's essay "Summa technologiae", published in 1966. Apparently, not much has changed in the last half a century.
They just aren't there! Why can't people of science accept this?
They don't accept it because it's just a hypothesis, and although it is reasonable, it is just one of many hypotheses that explain the current evidence.
In the absence of further evidence, there will be no way to tell which of the hypotheses is correct, and choosing one prematurely isn't helpful.
"First they came for the slanderers and i said nothing."
Here's a short film version: https://www.youtube.com/watch?...
There is a lot to be said for diminishing signal strength over the distances involved and the difficulties of picking a dispersed signal out of background noise.
Also, we are only looking at a narrow band of spectrum called the water hole.. AND we listen there because it is relatively quiet. The supposition is that will make it easier to get signals, but it could just as easily be that we are looking in the wrong portion of the em spectrum.