Web Page: Great Interviews of the 20th Century
Web Site: Exoplanets
Interview with Keri Johnson
The beginning introduces the podcast, the interviewer, and the interviewee.Darius: Hey, everybody, this is Darius for another installment of the Dare We Ask podcast. Today, I’m talking to physics teacher and exoplanet enthusiast Keri Johnson. Thank you for joining me.
Mrs. Johnson: It’s a pleasure to be here.
Darius: So, the big question—“dare we ask”—is how soon human beings will be living on exoplanets.
Mrs. Johnson: I wish I could say “tomorrow” or even “within a hundred years,” but it’s going to be closer to a thousand.
Darius: A thousand! But you said that scientists have found nearly a thousand exoplanets, and some are earthlike and in the habitable zone. What’s the holdup?
Mrs. Johnson: Well, it comes down to a few factors. The first earthlike planet proven to be in the habitable zone of its star was Kepler 22b. It’s about twice Earth’s diameter but probably about 40 Earth masses. That means it would have about 70 Gs of gravity on the surface. Your weight times 70.
Darius: You’d be crushed flat.
Mrs. Johnson: Right, unless you could be in a water ocean. Our bodies are 70 percent water, so if we were in the ocean, we could stand the tremendous gravity. But this planet is nearly 700 light years away. Even traveling at the speed of light, which is impossible, it would take 700 years to get there.
Darius: So I can give up hope of going where no man has gone before?
Mrs. Johnson: Not entirely. The problem is human bodies. We’re perfectly suited to life here on Earth. But human-made machines, and the computers in them, can happily live elsewhere. The Mars Rovers that were supposed to survive just a few months lasted years. And the Voyager probes sent out in 1977 are now outside the reach of the sun’s charged particles and are heading into interstellar space.
Darius: Are you saying that, while human bodies can’t live easily off our planets, our minds—at least in the form of human-built machines—can live out there happily forever?
Mrs. Johnson: If we design machines to do so, they may be carrying on the torch of human civilization into the future.
Darius: Thanks so much for your time, Mrs. Johnson. That’s it for another episode of Dare We Ask!
Web Page: Great Interviews of the 20th Century
Web Site: Exoplanets
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