Specifically, that triangular mouth has some pretty impressive chompers: sharp "teeth" that are, in fact, dense pillars of star-forming regions. Because while Pacman is known for gobbling up objects, nebulae are better known for giving birth to stars.
Here's how it works. As the dust and gas swirls around the nebula, massive knots start to form, until the gas and dust start to collapse under the gravitational attraction. This causes the material at the center to heat up into a "protostar," which starts gathering up even more dust and gas.
Not all that material will make up the star. Some of it might one day become a planet, or an asteroid, or comet - or just a dusty cloud hanging around its parent star.
Check out WISE's close-up of the Pacman Nebula above. See all those red dots scattered around the clouds of dust and gas? Those are baby stars still in the process of forming. That's the kind of detail you get when you look at the skies in infrared.
Image Credit: NASA/JPL-Caltech/UCLA