Ared supergiant star is ten times more massive than the sun. what would be the likely impact on the motion of earth if the sun were replaced by this red supergiant? a year on earth would be shorter because earth's orbital speed would increase. a year on earth would be shorter because earth's orbital speed would decrease. a day would be longer because the gravity experienced by earth would be stronger. a day would be longer because the gravity experienced by earth would be weaker.