Blue giant

A blue giant is a type of star. They emit such extreme radiation that if a vessel was to place itself in the coronasphere, it will not be detected by any sensors, however, the ship would not be able to read what is outside the coronasphere either. If unprotected the occupants of the ship (such as a Ha'tak) would be killed from the radiation within one hour, but ten hours should the shields are activated. In 2001, while stranded in an Unnamed Galaxy 4 million light years away from the Milky Way, SG-1 and Jacob Carter sent their Ha'tak over the coronasphere of a blue giant after a Replicator patrol ship attacked Apophis' mothership, to hide from the ship before either could win and come after them.