David Grinspoon Quote
Most of the evidence uncovered by Galileo would have been discovered by a similar fly-by spacecraft as long ago as about 2 billion years. In contrast, modulated radio transmissions could not have been detected before this century. Galileo was able to detect the noisy radio chatter of the civilization that made it. Presumably any aliens studying our planet would notice the same thing, though whether this cacophony is actually attributable to intelligence depends on what we think we mean by that term (a subject I’ll return to in chapter 6). Life
David Grinspoon
Most of the evidence uncovered by Galileo would have been discovered by a similar fly-by spacecraft as long ago as about 2 billion years. In contrast, modulated radio transmissions could not have been detected before this century. Galileo was able to detect the noisy radio chatter of the civilization that made it. Presumably any aliens studying our planet would notice the same thing, though whether this cacophony is actually attributable to intelligence depends on what we think we mean by that term (a subject I’ll return to in chapter 6). Life