The European Space Agency has launched two atomic clocks on a SpaceX rocket to the ISS to test Einstein's theory of ...

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This is no ordinary clock — it's a highly precise instrument built to put Einstein’s theories of special and general relativity to the test. ACES will measure time with unmatched accuracy ...

Albert Einstein didn't think so ... 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. Your friend is also holding ...

On Monday, the European Space Agency (ESA) launched the ACES set of atomic clocks to measure the effect of gravity on the passage of time.