The ESA’s Mars Express orbiter has captured this fantastic image of the Ladon Basin, specifically of this spectacular double impact crater:
Sigli and Shambe Credits: ESA/DLR/FU Berlin (G. Neukum)
The pair are named Sigli and Shambe and are believed to have been formed by a single object that broke into two larch fragments just before impacting the surface of Mars.
The shape and shallow nature of the impact crater suggest that it was formed when an asteroid or comet hits a planet at a reasonably shallow angle.
This particular pair is 16km across and shows significant fracturing of the crater floor. The pair also show signs of being partially filled with sedimentary material at some point after their formation. This implies that they may well have been lakes, as such material is only deposited under water, hinting once more of Mars’ more environmentally pleasant past.
You can read more about this image here