|
Fermi's paradox involves a species spreading out through the galaxy at in incredible rate. Such a species would have to have a single-minded devotion to expansion. A star's lifetime is very long. Humanity may have to move out of our solar system, but not for well over a billion years. We have great resources in our own solar system. If a species was somehow consuming its resources at such a prodigious rate that they needed to move on every few centuries, they would quickly run out of room to expand, they would use up the resources of the galaxy. I don't think such a wasteful species could ever exist.
The RF signature is very hard to detect. Right now, we could only detect an intense signature sent out with the intent of interstellar communication. The RF signature from Earth could not be detected from nearby stars. There is no reason to think that with the technology we have today that we could eavesdrop on the RF signals from alien civilizations. Stars just drown everything out.
|