The space adventure > Mariner III
Opposite, the first image of Phobos and Mars sent by Mariner 9.
Credit : NASA/Mariner 10 project
The surface of Mercury as seen by Mariner 10 in 1974. The central crater (crater Degas) has a diameter of 45 km.
Mercury's density is twice that of the moon, craters are generally smaller. The white streaks are materials ejected during the formation of an impact crater.