Second Generation Black Hole Mergers and Solar System Chaos

from Walkabout the Galaxy · host Josh Colwell, Jim Cooney, Addie Dove

Exquisitely detailed measurements of the ripples in spacetime from the mergers of black holes now show that some of these merging black holes were, themselves, created by an earlier black hole merging event. While this had been suspected to take place, we now have clear evidence of it. On a less dramatic scale but much closer to home, new simulations of the early solar system suggest the large population of moons of Uranus needed help from a now long lost fifth giant planet to survive. Join us for all this, space news, trivia, and a generally good time.

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This episode was published on June 4, 2026.

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