Why Craters Are Round, Size of Life, The Real Length of Day – TYTYK

Why Craters Are Round, Size of Life, The Real Length of Day – TYTYK

September 8, 2026 · 46 min · Season 17 · Episode 54

About this episode

Neil deGrasse Tyson and Chuck Nice discuss the roundness of moon craters, the scale of life, and the actual length of a day.

Is there a limit to how small life can be? Or how big? Neil deGrasse Tyson and Chuck Nice break down why all craters on the moon are round, the scale to life, and why the length of the day isn’t 24 hours.

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