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Planetary Radio: Space Exploration, Astronomy and Science

Ripples on the Cosmic Ocean

Planetary Radio: Space Exploration, Astronomy and Science

The Planetary Society

Technology, Science

4.81.4K Ratings

🗓️ 29 October 2025

⏱️ 69 minutes

🧾️ Download transcript

Summary

Historian Dagomar Degroot joins Planetary Radio to discuss his new book, “Ripples on the Cosmic Ocean: An Environmental History of Our Place in the Solar System,” which reveals how events across the Solar System have shaped life on Earth.

Transcript

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0:00.0

How did space shape the story of our planet?

0:05.2

We'll learn more this week on planetary radio.

0:13.1

I'm Sarah Al-Ahmed of the Planetary Society, with more of the human adventure across our solar system and beyond.

0:20.3

When we think about the environment, we often picture Earth, it's oceans, forests, and blue skies.

0:27.6

But historian Dagomar de Groot argues that our environment extends far beyond our planet.

0:33.6

His new book called Ripples on the Cosmic Ocean explores how events across our solar system,

0:38.3

from Martian Dust Storms to Solar Flares, have transformed life and history on Earth.

0:44.3

We'll talk about what he calls cosmic environmental history, and why understanding our place in the wider system may help us protect our world today.

0:52.3

Then Planetary Society Director of Government Relations, Jack Carelli,

0:56.0

joins me for a quick update on the political turbulence

0:59.0

surrounding NASA leadership and the Artemis program.

1:02.0

And we'll wrap things up, as always, with Bruce Betts,

1:05.0

our chief scientist for What's Up.

1:07.0

If you love Planetary Radio and want to stay informed about the latest space discoveries,

1:11.8

make sure you hit that subscribe button on your favorite podcasting platform.

1:15.4

By subscribing, you'll never miss an episode filled with new and awe-inspiring ways to know the cosmos

1:20.2

and our place within it.

1:24.6

Our relationship with space isn't limited to exploration, rockets, and telescopes.

1:29.9

The worlds around us have been shaping life on Earth for billions of years.

1:34.3

That includes everything from our sun to small asteroids.

1:38.1

Historian Dr. Dagomar de Groot argues that understanding these cosmic influences is

1:43.5

key to understanding our own planet's past,

...

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