The previous picture was of a Valentine-shaped cloud taken by WISE. However, that's only one part of a vastly larger complex of gas and dust called IC 1805. Right next to the Valentine (well, in cosmic terms, it's actually a couple of hundred light years away) is another star-forming region, another giant cavity carved by the winds from mighty stars.
But, in a fit of galactic irony, this particular cavity is shaped more like an actual human heart! You can even get a hint of the chambers inside it. Together, these two objects are colloquially called the Heart and Soul nebulae... and this
one is the heart.Higher res version
.Original release.Image credit: NASA/JPL-Caltech/UCLA