How far (distance) from the sun will a comet sublime to the vapor
state (Approach) or condense to the solid state (Depart)? If the water gas
was to collide with a planet would it put an ocean on that planet and change
It depends on the abundances of gases and water there is in the particular comet.
Hale-Bopp is still sublimating some 11 years after perihelion.