A Wraith Hive Ship over a nebula.
Nebulae are clouds of dust and gas that are found in space. In 2004, the Earth vessel Prometheus encountered an Interstellar cloud, a sentient nebula. (SG1: "Grace")
In 2005, when Dr. Daniel Jackson was stuck in the Astral Diner, the newspaper mentioned a Gondolthian nebula. (SG1: "Threads")
In 2008, the Atlantis expedition tracked Teyla Emmagan, who was posing as the Primary. On one of the stops, a Hive ship arrived over a nebula. (SGA: "The Queen")
In 2009, Destiny dropped out of FTL within sight of a nebula in an Unnamed galaxy. (SGU: "Intervention")