Time is relative. If you don’t believe me, get into a plank for one minute. How was that? Longest minute of your life, huh? And that’s just psychological time . Physical time, too, is relative and it's fairly easy for two clocks to become out of sync. Differences in speed or gravity do the trick, so a clock on Earth and a clock on Mars would not keep the same beat. Now, we know what the difference is – and it does not stay constant. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Physicists at the National Institute of Standards and Technology (NIST) have looked at the motion and pull of Mars with unprecedented precision. Using the time dilation formula to account for the motion and gravitational pull of an object, they were able t

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