Real World article
(written from a Production point of view)

In the final draft script of the Star Trek: Enterprise episode "Two Days and Two Nights", the Agasorian Nebula was a nebula which was viewed in the Risan night sky by Keyla Terrana and Jonathan Archer while they were in Suraya Bay on the planet Risa. Archer pointed out the Agasorian Nebula to Keyla, describing it as a "reddish blur." He also asked if she had seen it before and she replied negatively.