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Time dilation explains why two working clocks will report different times after different accelerations. For example, time goes slower at the ISS, lag
Time dilation explains why two working clocks will report different times after different accelerations. For example, time goes slower at the ISS, lagging approximately 0.01 seconds for every 12 Earth months passed. For GPS satellites to work, they must adjust for similar bending of spacetime to coordinate properly with systems on Earth.
Time passes more quickly further from a center of gravity, as is witnessed with massive objects (like the Earth).
Time passes more quickly further from a center of gravity, as is witnessed with massive objects (like the Earth).
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Foucault's pendulum in the Panthéon of Paris can measure time as well as demonstrate the rotation of Earth.
Foucault's pendulum in the Panthéon of Paris can measure time as well as demonstrate the rotation of Earth.
Andromeda galaxy (M31) is two million light-years away. Thus we are viewing M31's light from two million years ago, a time before humans existed on Ea
Andromeda galaxy (M31) is two million light-years away. Thus we are viewing M31's light from two million years ago, a time before humans existed on Earth.