"Down" is simply the direction gravity is pulling you, and "up" is just the opposite direction. ... Gravity is a centrally attractive force, so "going down" means falling or being pulled towards the center of the nearest massive object.
"Gravity is a centrally attractive force, so "going down" means falling or being pulled towards the center of the nearest massive object. If you are in space and the earth is the nearest astronomical object, you fall towards earth. ... Down is not towards the earth's South Pole and up is not towards the earth's North Pole."
