26,000 years sounds more like the period for Earth's axial precession. https://en.wikipedia.org/wiki/Axial_precession https://en.wikipedia.org/wiki/Axial_preces

26,000 years sounds more like the period for Earth's axial precession. https://en.wikipedia.org/wiki/Axial_precession https://en.wikipedia.org/wiki/Axial_precession . What you describe doesn't make sense. The Earth's orbit is effectively constant at that timescale, as are the asteroids in the main asteroid belt - otherwise interactions with Earth's would have changed the orbit. There are conjectures of regular extinction events on 30-60M year intervals, but the data for that isn't strong. https://en.wikipedia.org/wiki/Extinction_event#Patterns_in_frequency https://en.wikipedia.org/wiki/Extinction_event#Patterns_in_f...