Gravity

U.S. Open Inspires First Tennis Match in Space

Astronauts were allowed to hit under and over the net and decided that the primary goal was in continuing to get the ball past the net in conditions that lack a gravitational constant.

A Brief History of My Friend Stephen Hawking

Millions have had their cosmic horizons widened by his best-selling books; and even more, around the world, have been inspired by a unique example of achievement against all the odds.