SETI stands for the Search for Extra-Terrestrial Intelligence. Kindly note that the word 'radio' appears nowhere in that phrase, but searching for synthetic radio transmissions from extraterrestrial civilizations appears to be near synonymous Bloggind with Carl Kruse
SETI, as strengthened via the popular movie "Contact" (based on Carl Sagan's novel). Now there may be nothing flawed with radio SETI. The seek for radio waves has been well thought out and would seem to supply up the maximum probability for success. However, there are more ways to skin the SETI cat (as it have been), and after forty nine years of searching primarily by way of radio, I counsel that some more ways be adopted and explored. Any part of the electromagnetic (EM) spectrum is suitable and up for investigation, corresponding to optical SETI (looking for laser beams) or infrared SETI (searching for Dyson Spheres) or just in search of alien artifacts (as within the novel/film "2001: A Area Odyssey"). From that, we note that one can strategy the examine of UFOs and/or historical astronauts as representing a type of SETI. No matter investigation tells you that extraterrestrial intelligence (ETI) exists, or once existed, or would not exist at all (and a negative result's as necessary as a constructive one) is SETI.
Why do SETI in any respect? That's an obvious first question. Thankfully, there are lots of good solutions to that question. There's pure scientific curiosity for starters - exploring just for the sake of exploring. Then there's the more philosophical method in that SETI helps to higher decide our place within the cosmos. A negative answer is just as important as a optimistic reply in determining whether or not humanity is unique, prime of the heap, one of the great unwashed cosmic crowd, or the new boy on the block. SETI has a sensible side too in figuring out the existence of potential neighbors which might be sources of benefit and/or threats to us. Clearly, a select few scientists, SETI lovers, have long felt that SETI was, and is, worth doing. Radio SETI is (as of this writing), a quite mature science now forty nine years old.
Now if seven is a fortunate number, then seven occasions seven ought to be even luckier, yet, some 49 years after the primary radio SETI experiment (Project Ozma) was performed by Dr. Frank D. Drake, there's be no luck in detecting any sign of another technological extraterrestrial civilization (forty nine years as I write this - it is even longer now). What does this suggest to us as a life type with an developed technological civilization? The place are our 'kin' on the market among the many stars?
Firstly, it suggests that radio SETI isn't going to be quite as easy as first envisioned. The number-crunching back in those early days advised that ETI with a suitable detectable technology (radio emissions or reasonably transmissions) would be fairly common. Though solely a relative few of those haystack stalks have been sifted for that needle, it is changing into clearer that form of SETI is not going to be straightforward; N (the number of technologically radio communicating ETI in the cosmos) is not going to be a particularly giant number. So, some constraints on the SETI concept and logic have come home to roost.
By way of the search thus far, it's clear (to me anyway) that there aren't any Type III civilizations (able to harness the energy output of a complete galaxy) in any galaxy even remotely 'shut' (in cosmic phrases) to us. If there were any Type 2 civilizations (skill to command the energy output of a whole star) almost in our own galaxy it should have proved pretty obvious by now. There have been in fact many false alarms, but additionally just a few cases that looked like a positive signal was received. Alas, all have been one-offs and have by no means been picked up again. With out verification, these 'wow' signals remain enigmas, but not proof constructive of extraterrestrial intelligence (ETI).