Craters on Mars

This image taken by the Hubble Space Telescopes was made during
the opposition of 2003. Arabia Terra looks like the Arabian peninsula
on Earth. It is an old, highly eroded region dotted with numerous
flat-bottom craters. Lava-covered Syrtis Major was first identified by
Christiaan Huygens in 1659. A single impact carved out Hellas Planitia,
which is five times the size of Texas. Inset: This mosaic of images from
the Viking 1 and 2 orbiter spacecraft shows an extensively cratered
region located south of the Martian equator. Note how worn
down these craters are compared to those on Mercury and
our Moon