This beautiful heart is located nearly on the equator of Mars, and is about 2 km (1.2 miles) long. The picture was taken by the Mars Reconnaissance Orbiter.
Like most valentine-shaped features on Mars, this is a collapsed pit - you can see the ripple of sand dunes in the upper right part of the heart. It may have formed when water just under the surface was catastrophically released as a huge flash flood, causing the surface above it to slump... and given the shape of the pit, I'll try to avoid any "tears of joy" analogy.Higher res version
.Image Credit: NASA/JPL/Malin Space Science Systems