The book, From the Earth to the Moon written by Jules Verne, describes firing the explorers from a canon to reach the Moon. This video explores Newton’s equation for gravitational force and how these forces change over distance. Anu Ojha explains how the International Space Station is in freefall, and how this leads to the idea of weightlessness in space. Verne correctly calculated the speed needed to send the explorers to the Moon, even though his solution was never practical in the real world. Anu goes on to explain how the acceleration provided by today’s multi-stage rockets can be used as a solution. One of the European Space Agency’s Automated Transfer Vehicles (ATV) is named after Jules Verne. The ATV uses a multi-stage rocket to reach the International Space Station.