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Scientists have calculated just how much faster clocks tick on Mars

By Megan Lim,
Christopher Intagliata, Scott Detrow
Published December 9, 2025 at 4:05 PM EST

Clocks tick faster on Mars than they do on Earth, in part because Mars experiences less gravitational pull from the Sun. Now scientists have calculated just how much faster -- 477 microseconds, on average.

Copyright 2025 NPR
Megan Lim
[Copyright 2024 NPR]
Christopher Intagliata
Christopher Intagliata is an editor at All Things Considered, where he writes news and edits interviews with politicians, musicians, restaurant owners, scientists and many of the other voices heard on the air.
See stories by Christopher Intagliata
Scott Detrow
Scott Detrow is a White House correspondent for NPR and co-hosts the NPR Politics Podcast.
See stories by Scott Detrow
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