2008 May 22
Windblown NGC 3199 Credit &Copyright: Ken Crawford(Rancho Del Sol Observatory),Macedon RangesObservatoryNGC 3199 lies about 12,000 light-years away,a glowing cosmic cloud in the southern constellationof Carina.The nebula is about 75 light-years across in this haunting,false-color view.Though the deep image reveals a more or less completering shape, it does look very lopsided with a much brighter edgeat the lower right.Near the center of the ring is aWolf-Rayet star, a massive, hot,short-lived star that generates an intense stellar wind.In fact, Wolf-Rayet stars are known to create nebulaewith interestingshapes as their powerful winds sweepup surroundinginterstellarmaterial.In this case, the bright edge was thought to indicate abow shockproduced as the star plowed through a uniform medium, like a boatthrough water.But measurementshave shown the star is not really moving directlytoward the bright edge.So a more likely explanation is that thematerial surrounding the star is not uniform, butclumped and denser near the bright edge of windblown NGC 3199.sunbathing%7Cutmcsr%3Dhttp%3A%2F%2Fantwrp%2Egsfc%2Enasa%2Egov%2Fapod%2Fastropix%2Ehtml%7Cutmcmd%3Drss%3B%2B)

More: continued here