A heart-shaped crater in the Galilae region on the Moon. Credit: ASA/GSFC/Arizona State University; 3-D by Nathanial Burton-Bradford.

If you have red/green 3D glasses, you can see the Moon’s heart in 3D!  To see the crater in it’s real orientation (this image rotated for effect), go to Universe Today.

UPDATE:

Mars, not wanting to be left out, also sends it’s Valentine’s Day greetings to the lovers of Earth.

 

A heart-shaped feature in the Arabia Terra region of Mars is show on the left, with additional context on the right, in excerpts of an image taken by the Context Camera on NASA's Mars Reconnaissance Orbiter. Image Credit: NASA/JPL-Caltech/MSSS

And another UPDATE:

The Heart Nebula.  Perhaps this is the look of a broken heart.