A welcome sign?
The surface of Mars is full of natural hearts everywhere!
We love you guys! As reported by Chris Hadfield, the surface of Mars is literally covered by natural heart-shaped craters. Why do all have this shape is a mystery, but as shown in the following photo gallery, there are many, many!
Here the explanation for one of these heart craters:
[quote_box_center]A small impact crater near the tip of the heart is responsible for the formation of the bright, heart-shaped feature. When the impact occurred, darker material on the surface was blown away, and brighter material beneath it was revealed. Some of this brighter material appears to have flowed further downslope to form the heart shape, as the small impact occurred on the blanket of material ejected from a much larger impact crater.[/quote_box_center]