Adam Frank: belief

Transcript context

…Can you explain the Drake Equation? People have various feelings about the Drake Equation. It can be abused. The story actually is really interesting. Frank Drake in 1960 does the first ever astrobiological experiment. He gets a radio telescope, points it at a couple of stars, and listens for signals. That was the first time anybody had done any experiment about any kind of life in the history of humanity. He does it, and he’s waiting for everybody to make fun of him. Instead, he gets a phone call from the government and says, “Hey, we want you to do a meeting on interstellar communications.” He’s like, “Okay.” They organized a meeting with just eight people. A young Carl Sagan is going to be there as well. The night before, Drake has to come up with an agenda. How do you come up with an agenda for a meeting on a topic that no one’s ever talked about before? What he does, what’s so brilliant about the Drake Equation, is he breaks the problem of how many civilizations are there out there into a bunch of sub-problems. He breaks it into seven sub-problems. Each one of them is a factor in an equation that, when you multiply them all together, you get the number of civilizations out there that we could communicate with. The first term is the rate at which stars form. The second term is the fraction of those stars that have plants, F-sub-P. The next term is the number of planets in the habitable zone, the place where we think life could form. The next term after that is the fraction of those planets where actually an abiogenesis event, life forms, occurs. The next one is the fraction of planets on which you start to get intelligence. After that, it’s the fraction of planets where that intelligence goes on to create a civilization. Then finally, the last term, which is the one that we really care about, is the lifetime, have a civilization and how long does it last. When you say we, we humans?…

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