October 19, 1999: This oddly shaped object is an aging, Sun-like star near the end of its life. The Hubble telescope's infrared camera, called the Near Infrared Camera and Multi-Object Spectrometer, captured a fleeting phase in the death march of this star. In these pictures, a red giant star is transformed into a planetary nebula, the glowing remnants of a dying star. The star is shrouded in dust and gas in the center of these pictures. The "wings" of material, called a nebula, are dust and gas cast off by the declining star.See the rest:
The star is blowing out gas and dust in two opposite directions. These blasts of gas are traveling at speeds up to 450,000 mph. The fast-moving gas and dust are forming several thin streamers [on the right of both images]. A jet of material can be seen in the left lobe. On the right, wisps of material in jet-like streamers appear to strike dense blobs of gas. By studying these structural details, astronomers will gain a better understanding of the final stages in the lives of stars like our Sun.
An infrared camera "sees" through dust and gas to capture more details of the nebula's structure. Unlike most visible light, infrared light is not absorbed by dust.
The two pictures tell different stories about the last gasps of this dying star. The black-and-white image shows more clearly the faint detail and structure in the nebula. The color picture reveals that the composition and temperature of the material ejected from the star varies.
Astronomers have dubbed the object the "Rotten Egg" Nebula because of the large amount of sulfur compounds found in the gas surrounding the star. The object's "proper" name is OH231.8+4.2, and it resides in the constellation Puppis.
Credit: NASA, ESA, William B. Latter (SIRTF Science Center/California Institute of Technology), John H. Bieging (University of Arizona), Casey Meakin (University of Arizona), A.G.G.M. Tielens (Kapteyn Astronomical Institute), Aditya Dayal (IPAC/NASA Jet Propulsion Laboratory), Joseph L. Hora (Center for Astrophysics), and Douglas M. Kelly (University of Arizona).