Migrating planets in the solar system
One more evidence migration occured in the past.
3.8 Billion years ago....Plenty of theings seem to have happened in the inner solar system:
Mercury's volcanism ceased.
Venus started it s greenhouse effect.
The Moon got heavily bombarded.
Life started on earth.
Mars lost its atmosphere
Perhaps the same cause and effect: a huge increase in asteroid bombardment followed by a much more stable evolution (far less impacting asteroids) once migration stopped.