A NASA Discovery mission to conduct the first orbital study of the innermost planet
NASA logo carnegie institution logo JHU APL logo
MESSENGER spacraft
Why Mercury?
The Mission
News Center
Science Operations
Who We Are
Related Links

MESSENGER App Mercury Quickmap Question and Answer Mercury Orbital Operations Where is MESSENGER? Where is Mercury now? Subscribe to MESSENGER eNews


Length of One Year

The length of one year for any planet is the time that it takes it to make one orbit around the Sun. For Earth the length of one year is about 365 Earth days. It takes Mercury only 88 Earth days to orbit the Sun. To see just how swiftly Mercury orbits the Sun compare it to Pluto, which takes over 248 Earth years to make one orbit.

A Day on Mercury

How long is a Mercurian year? In this animation you can watch the Sun rise and set on Mercury over the course of a year. Pay attention to the "STATS" box in the lower left part of the screen. Click on the image above.

Previous FactNext Fact