Mercury Transiting the Sun (IMAGE) NASA/Goddard Space Flight Center Caption Mercury's proximity to the Sun and small size make it exquisitely sensitive to the dynamics of the Sun and its gravitational pull. Credit NASA/SDO Usage Restrictions None License Licensed content 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.