The nearest planet to the Sun, Mercury, is red-hot by day and frozen by night.
If somebody landed there by day, the Sun would appear twice and a half bigger than it can be seen from Earth but the sky would be dark since there is no atmosphere.
Earth would appear like a big bluish "star". The gravity of the Sun makes possible that the planet, while slowly revolving on its axis, revolves around it along an oval orbit.
The appearance of Mercury proves its violent past: lots of asteroids and comets hit and covered it with craters; there are even craters into other craters.
