Other names include moon jelly, common jellyfish, and saucer jellyfish. Apparently one of the most ubiquitous cnidarians on the planet. Lights in the back come from other aquariums, because thanks Android phone.
Oceans all over the world, and they're capable of surviving temperatures between 6 °C to 31 °C.
Found at the Houston Zoo! I could sit and watch them all day :-)