PBS Space Time PBS Space Time

How Earth ACTUALLY Moves Across the Galaxy

Nov 3, 2026 · 26m

Summary

This episode debunks the "corkscrew" myth of planetary motion, explaining that Earth’s path is best understood through multiple reference frames, from the solar barycenter to the galactic center. The host details the Sun's complex epicyclic orbit and vertical oscillations through the Milky Way, linking these movements to dark matter detection and potential mass extinctions. The discussion concludes by defining our velocity relative to the cosmic microwave background and briefly addressing why carbon remains superior to silicon for supporting life.

Topics discussed

Sponsor: LinkedIn Hiring Pro Sponsor: PayPal Pay in 4 Debunking the planetary helix myth Galilean relativity and inertial frames Choosing useful reference frames for motion Solar system barycenter and Earth's orbit Sponsors: LinkedIn and PayPal Sponsor: Cuvasier Cognac Solar system motion through the Milky Way Local Standard of Rest and Sun's peculiar motion Sun's epicyclic path and vertical oscillation Sponsors: LinkedIn, PayPal, Cuvasier Testing dark matter models via stellar oscillations Ecliptic tilt and Earth's varying galactic speed Solar system orientation over galactic orbits Motion relative to the Great Attractor Sponsors: LinkedIn, PayPal, Cuvasier Cosmic Microwave Background rest frame Q&A: Silicon vs Carbon based life Q&A: Non-chemical life and multiverse TNT vs Nitroglycerin correction and sponsors
Listen ad-free on Castria