Why is space a vacuum?

A body is falling freely under the action of gravity alone in vacuum. Which of the following quantities remain constant during the fall? | Shaalaa.com

Watch A Bowling Ball And Feather Falling In A Vacuum

Feathers And Bowling Balls Fall At Same Rate In World's Largest Vacuum NASA’s Space Power Facility located at the Glen Research Center, in Sandusky, Ohio has the world’s largest vacuum . The Space Simulation Vacuum Chamber mimics the conditions of space, where there is almost no air resistance, so objects would fall at the same rate despite a difference in weight. Professor Brian Cox recently used the vacuum chamber to test the gravity theories postulated by Galileo and Sir Isaac Newton. These e