Illustration of MESSENGER's Orbit Observations (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption NASA and MIT scientists analyzed subtle changes in Mercury's motion to learn about the Sun and how its dynamics influence the planet's orbit. The position of Mercury over time was determined from radio tracking data obtained while NASA's MESSENGER mission was active. Credit NASA's Goddard Space Flight Center Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.