... Though the deep image reveals a more or less complete ring shape, it does look very lopsided with a much brighter edge at the lower right. Near the center of the ring is a Wolf-Rayet star , a massive, hot, short-lived star that generates an intense stellar wind. ... So a more likely explanation is that the material surrounding the star is not uniform, but clumped and denser near the bright edge of windblown NGC 3199. ... NASA Web Site Statements, Warnings, and Disclaimers . ...