Mercury

The closest planet to the Sun and the smallest of the eight. With no atmosphere to moderate its temperature, its surface swings from 430 °C by day to −180 °C by night. It spins so slowly that a single Mercurian day lasts almost two of its years.

Diameter	4,879 km
Average distance from Sun	57.9 million km
Local year	88 Earth days
Moons	0