Well, the paradox isn't about life, it's about intelligent life. Yes, there are some serious assumptions made, but the reason why it's troubling is because the sheer numerical scales that it takes into account. It's just troubling to believe either 1.) With millions of potential life bearing planets, we are the only ones that produced intelligence. 2.) Intelligence is out there and for some reason is ignoring us. (We assume it is ignoring us, because as said, even with sub light engines a fully tier 1 society would populate the galaxy in 4 million years.)Mais que veut dire "reveite"?
I don't see what is so paradoxical about the Fermi paradox. It feels to me it is built on a number of weak assumptions. I mean, here on planet earth, right now, there are several million different types of life forms (8.7 some say - bacteria and the likes excluded). Put them all except humans on an earth like planet in a neighboring solar system and SETI would not detect them.
I dont think you understand the problem. The article describes it very well but the paradox isnt that we dont see other civs like ours. It is that we dont see any civs much beyond our tech tree.Mais que veut dire "reveite"?
I don't see what is so paradoxical about the Fermi paradox. It feels to me it is built on a number of weak assumptions. I mean, here on planet earth, right now, there are several million different types of life forms (8.7 some say - bacteria and the likes excluded). Put them all except humans on an earth like planet in a neighboring solar system and SETI would not detect them.
I agree. The special moderation rules are also silly there.I must be the only person who thinks the grown up forum is pathetic. A bunch of people constantly laughing at people needing a safe space have their own safe space.
Some things in the article are tangentially related but none are addressed in the same context. For instance the time scale problem is only addressed in the context of a thousand Type II and Type III civilizations existing in our galaxy (estimation reached by the absurd chain of 1% conservative estimates), but us being here for too short a while to have encountered them (though Sagan is quoted with another time related problem that does not lack charm: other civilizations might have a totally different relashionship with time - 12 years to say hello is the example).Of course if you actually read the article it covers those things too but you know, nbd I guess.
Why would someone broadcast random noise? There's no reason to think a radio transmission originating 1000 light years away would for some reason be transformed to random noise aside from dopplering and I believe we account for that when doing a sky survey.I didn't read the article, but why do we assume anything we're receiving would even make sense across the distance? There could be another civilization doing exactly what we're doing, but by the time our messages intersect with each others' respective detection apparatus they're indistinguishable from random noise.
http://www-pw.physics.uiowa.edu/plas...r/heliopr.htmlSince August 1992, the radio antennas on the spacecraft, called the plasma wave subsystem, have been recording intense low- frequency radio emissions coming from beyond the solar system. For months the source of these radio emissions remained a mystery.
"Our interpretation now is that these radio signals are created as a cloud of electrically charged gas, called a plasma, expands from the sun and interacts with the cold interstellar gas beyond the heliopause," said Dr. Don Gurnett, principal investigator of the Voyager plasma wave subsystem and a professor at the University of Iowa. [see illustration]
The sun is the center of our solar system. The solar wind is a stream of electrically charged particles that flows steadily away from the sun. As the solar wind moves out into space, it creates a magnetized bubble of hot plasma around the sun, called the heliosphere. Eventually, the expanding solar wind encounters the charged particles and magnetic field in the interstellar gas. The boundary created between the solar wind and interstellar gas is the heliopause.
"These radio emissions are probably the most powerful radio source in our solar system," said Gurnett. "We've estimated the total power radiated by the signals to be more than 10 trillion watts. However, these radio signals are at such low frequencies, only 2 to 3 kilohertz, that they can't be detected from Earth."
In May and June 1992, the sun experienced a period of intense solar activity which emitted a cloud of rapidly moving charged particles. When this cloud of plasma arrived at the heliopause, the particles interacted violently with the interstellar plasma and produced the radio emissions, according to Gurnett.
"We've seen the frequency of these radio emissions rise over time. Our assumption that this is the heliopause is based on the fact that there is no other known structure out there that could be causing these signals," Gurnett continued.
Because of the Voyagers' unique positions in space, they serendipitously detected and recorded the radio emissions. "Earth-bound scientists would not know this phenomenon was occurring if it weren't for the Voyager spacecraft," Gurnett added.
ok.My points are that the article is not very good, that the Fermi paradox does not feel very paradoxical to me and that my speculations as to why are not covered by said article and that many of the speculations listed by the article use a number of poor assumptions.