The European Space Agency (ESA) has launched ACES, or the Atomic Clock Ensemble in Space, to the International Space Station ...

The European Space Agency (ESA) has launched one of its most precise science experiments to date — the Atomic Clock Ensemble ...

He called the slowing of time due to motion time dilation. Imagine you're standing on Earth holding a clock. Your friend is in a rocket zooming past you at nearly 186,000 miles per second.

That's because to time-dilation effects. First, time appears to move slower near massive objects because the object's gravitational force bends space-time. The phenomenon is called "gravitational ...

an effect called time dilation. Clocks on the International Space Station, actually run 0.014 seconds slower each year than the same clocks on earth because of time dilation.