Mercury  is the closest planet to the Sun.

 It is only 39 million miles from the sun.

    Mercury is covered with millions of craters.

Below is a photo of the Caloris Basin which is the area closest to the Sun of any planet when Mercury is at perihelion (closest to the Sun).  The temperature a noon is over 800 ⁰F.

  You can see the edge of a very large crater to the left of the picture