Suppose you are an astronaut in deep space, far from any source of gravity. You have two objects that look identical, but one has a large mass and the other a small mass. How can you tell the difference between the two?

Solution: Step 1 of 2 We know that F= ma When there is no gravity at particular place, then undergoes same force on those two and heavier mass accelerates less and lighter one accelerates more then we can identify the mass difference. On the earth’s surface, because of the gravity it can easily be identifiable a heavier and lighter weight body. In space, there is no gravity. It is just a vacuum. To differentiate the heavier body from a lighter one is just tricky.