When people find something they have never seen and do not understand they give it a name. It makes them feel like they know something, even when there really is little understanding. So somebody somewhere suggested a name for something several people reported seeing and photographing. It stuck. Enter Steve: http: //www.esa.int/Our_Activities/Observing_the_Earth/Swarm/When_Swarm_met_Steve The picture is beautiful. The article is worth a read, IMO. The article goes on to describe how a somewhat common phenomenon became noticed and now is the subject of study by Eric Donovan - U Alberta I believe.