Astronomical Overview
Mercury
Fig. 4.6 Mercury Field
Mercury is like a giant cinder with a strong pockmarked surface.
Its proximity to the sun has caused its atmosphere to be burned away completely. On
the sunny side the temperature rises to 430 °C, on the dark side it drops to - 170 °C. It
turns around the sun in 88 days and has a rotational speed around its axis of 58.6 days.
The marked surface may also be the effect of shrinkage.