Solar flare, April 11th 2013, 08:30 UTC.
This flare is about two million kilometers wide, 5 times the distance between the Earth and the Moon.
Pom-Pom Crab (Lybia Tessalatta)
The pom pom crab forms symbiotic relationships with some species of sea anemones. When threatened, the crab waves its highly toxic “pom poms” at the predator. The anemones in return get more exposure to food particles.
Klaus Stiefel, flickr