the.com/planetary migration
planets don't stay where they're born, they slide toward the star or flee it entirely.
means the gradual change in a planet's orbit over time due to gravitational interactions with the disk of gas and dust it formed in, or with other planets.
from proposed in the 1980s to explain orbital resonances in our solar system, the theory exploded in relevance once astronomers started finding hot jupiters in the 1990s, giant planets orbiting absurdly close to their stars where no one thought they could form.
hot jupitersformed far out, migrated inward over millions of years
jupiter itselfmay have wandered toward the sun, then retreated
type i vs iismall planets and giants migrate by different mechanisms
grand tackjupiter and saturn's migration reshaped the early solar system