Did you know? - Mercury

A day on the planet Mercury is twice as long as its year.

Mercury rotates very slowly but orbits the Sun at 180,000 km/h

Mercury orbits the Sun in slightly less than 88 days

Its interesting to compare:

The Earth orbits the Sun in 365 days at an average speed of 107,220 km/h

The fastest known Neutron star rotates over 700 times in one second.

Left: Mercury photographed by NASA's Messenger spacecraft, copyright NASA.