Our astronauts, when they go orbiting around the earth, they actually come back slightly younger than a twin that they would have on the planet Earth who was stationary. This is called the twin paradox.
Related Keywords: Back Go Planet Paradox Come Twin Our
Related Authors: Stephen Hawking Carl Sagan Sigmund Freud Richard Dawkins Isaac Asimov J. Robert Oppenheimer Neil deGrasse Tyson
