Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute in New York City. Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three years at the Paris Institute of Astrophysics, followed by a research fellowship in Trieste, Italy, His research focuses on many diverse topics, from the emptiest regions of the universe to the earliest moments of the Big Bang to the hunt for the first stars. As an 'Agent to the Stars,' Paul has passionately engaged the public in science outreach for several years. He is the host of the popular 'Ask a Spaceman!' podcast, author of 'Your Place in the Universe' and 'How to Die in Space' and he frequently appears on TV — including on The Weather Channel, for which he serves as Official Space Specialist.
. Still, it's measurable. In 1971, physicists Joseph Hafele and Richard Keating put atomic clocks onboard jet aircraft and sent them flying around the world. When the clocks returned, they were out of sync with a ground-based clock by exactly the amount predicted by special relativity.
This is the crucial thought experiment that helped Einstein develop special relativity. If you're moving at the exact same speed , it's impossible to tell if you're the one who's moving, or if you're staying still and the rest of the universe is moving. So, from Bob's perspective, he's staying perfectly still, and it's Alice that's racing away from him. Yes, it sounds improbable, but from the point of view of physics, Bob can't tell the difference. In Bob's calculations, his clock is running normally, and it's Alice's that should be running slowly. So, when they meet again, she should be younger than him, because not as much time has passed for her.
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