A day on Mercury lasts twice as long as its year
On Mercury, a single solar day lasts an astonishing 176 Earth days—twice as long as its 88-day year—due to its unique rotation and orbit.
Imagine a day lasting longer than a year! On Mercury, a single solar day stretches for 176 Earth days, which is exactly twice as long as its 88-day year. This happens because Mercury spins very slowly while orbiting the Sun quickly, creating a unique 3:2 spin-orbit resonance.
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