This smiley face was actually a pair of galaxies making up the eyes and a mouth, caused by an effect known as “strong gravitational lensing.”
On NASA’s website, they describe how this effect is created:
A ring — known as an Einstein Ring — is produced from this bending of light, a consequence of the exact and symmetrical alignment of the source, lens and observer and resulting in the ring-like structure we see here.
But enough of the science. It’s best to just think of this as the Universe shooting us a quick and friendly smile.