Facts about Mercury

Average Solar Distance 57.8 million km
Revolution Period 87.9 Earth days
Rotation Period 58.6 Earth days
Equatorial diameter 4878 km
Gravitational Pull 0.38 times the Earth
Natural Satellites 0

The StarChild site is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/ GSFC.

StarChild Authors: The StarChild Team
StarChild Graphics & Music: Acknowledgments
StarChild Project Leader: Dr. Laura A. Whitlock
Curator: J.D. Myers
Responsible NASA Official: Phil Newman