Why does a 1kg object fall faster than a feather?

This was first proven true by the renown astronomer and scientist
Galileo Galilei.  At the time of Galileo, many believed a more massive object would indeed fall faster than a less massive object.  Galileo proved both objects would accelerate at the same rate of speed by demonstrating, using two sphere-like objects, dropped from the tower of Pisa.  In a sealed vacuum environment, where there were no air resistance to impede the motion of the feather, the 1 Kilogram object would fall at the same rate as the much lighter feather.  This is so because the force of gravity being exerted on the two objects is the same.  On earth, you have extenuating circumstances, such as air resistance holding the feather in sway.  If the air resistance were removed, the feather would fall at the same rate as any other object, whether it was heavier or not.  The Apollo 15 astronauts recreated Galileo's famous experiment on the moon, where the force of gravity is much less and there is no atmospheric intervention.  They were greeted with the same results Galileo attained, about 300 years earlier.