Planetary Nebula NGC 6818
Depicts: NGC 6818, IRAS 19411-1416
Copyright: Robert Rubin (NASA Ames Research Center), Reginald Dufour and Matt Browning (Rice University), Patrick Harrington (University of Maryland), and NASA
This Wide Field and Planetary Camera 2 image of NGC 6818 shows two
distinct layers of gas (with dust): a spherical outer region and a brighter,
vase-shaped interior "bubble." Astronomers believe that a fast wind -
material propelled by radiation from the hot central star - is creating the
inner elongated shape. The central star of the planetary nebula appears
as a tiny blue dot. The material in the wind is traveling so fast that it
smashes through older, slower-moving stellar debris, causing a "blowout"
at both ends of the bubble (lower right and upper left).
Last Update: 1 September 2019