Are We Meant to Leave Earth? Why Humanity May Have No Choice but to Go to Space

Are We Meant to Leave Earth? Why Humanity May Have No Choice but to Go to Space

Astrobiologist Caleb Scharf joins Michael Shermer for a wide-ranging conversation about the past, present, and future of our relationship with space. Drawing on his new book The Giant Leap, Scharf explains why human expansion beyond Earth may be less a choice than an evolutionary development, and he walks through the physics, history, and personalities that shaped our journey off the planet.

Scharf also explains the biological toll of radiation and microgravity, and why terraforming Mars is probably unrealistic and why our future might rely more on building vast rotating habitats in space than on settling other planets.

Caleb Scharf is an astrobiologist and recipient of the 2022 Carl Sagan Medal. He was Director of Astrobiology at Columbia University in New York and is now the Senior Scientist for Astrobiology at the NASA Ames Research Center in Silicon Valley. He is author of more than 120 scientific papers and over 500 popular science articles. His new book is The Giant Leap: Why Space is the Next Frontier in the Evolution of Life.

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Episoder(642)

Does Consciousness Break the Laws of Physics?

Does Consciousness Break the Laws of Physics?

If we could explain everything happening in your brain, would there still be something left to explain about you? Physicist Avshalom Elitzur thinks so—and argues that accounting for consciousness may ...

22 Sep 46min

Jared Diamond: How Much Can One Person Change History?

Jared Diamond: How Much Can One Person Change History?

Would World War II have happened without Hitler? Would someone else have built Apple without Steve Jobs? Jared Diamond joins Michael Shermer to ask how much history depends on particular people. From ...

15 Sep 1h 29min

Why America Failed to Stop 9/11  |  Gerald Posner & Michael Shermer

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How did 19 hijackers evade the world's most advanced intelligence apparatus despite years of warnings? Twenty-five years after 9/11, journalist Gerald Posner joins Michael Shermer to explain the secur...

11 Sep 42min

Why Be Honest When Cheating Pays?

Why Be Honest When Cheating Pays?

Most of us think of ourselves as honest. But would we still tell the truth if lying got us what we wanted—and nobody would ever find out? Philosopher Christian Miller joins Michael Shermer to discuss ...

9 Sep 1h 45min

Is the Future Unknowable? Uncertainty, Free Will, and the Limits of Science

Is the Future Unknowable? Uncertainty, Free Will, and the Limits of Science

What if uncertainty isn't a temporary problem science will eventually solve, but a fundamental feature of reality? Neuroscientist Stuart Firestein joins Michael Shermer to make the case that the unive...

1 Sep 1h 23min

Why We Want to Believe in Aliens and Why We Still Haven't Found Them

Why We Want to Believe in Aliens and Why We Still Haven't Found Them

UFOs were once the stuff of tabloids and conspiracy theories. Today they're the subject of congressional hearings, Pentagon investigations, mainstream news coverage, and a new wave of claims about gov...

25 Aug 1h 13min

Is There a Second Arrow of Time? A New Law of Evolution, Information, and Complexity

Is There a Second Arrow of Time? A New Law of Evolution, Information, and Complexity

Why does the universe produce ever more elaborate forms, from atoms and minerals to cells, organisms, brains, technology, and civilization? The familiar laws of physics can explain much of what happen...

18 Aug 1h 18min

Why Good People Disagree About Right and Wrong

Why Good People Disagree About Right and Wrong

Why do reasonable people disagree so strongly about right and wrong? And why are we so quick to assume that people on the other side of a moral or political issue are irrational, selfish, ignorant, or...

11 Aug 1h 57min

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