APOD Next: the Coming NASA Astronomy Picture of the Day Before it Goes Live. Please be Kind and Share with Proper Care.

Wednesday, December 30, 2009

Next APOD: 2009 December 31 - Dust and the Helix Nebula

APOD Next the Coming NASA Astronomy Picture of the Day

APOD: 2009 December 31 - Dust and the Helix Nebula

ap091231_html

Dust and the Helix Nebula
NASA, JPL-Caltech, Kate Su (Steward Obs, U. Arizona) et al.

Explanation: Dust makes this cosmic eye look red. The eerie Spitzer Space Telescope image shows infrared radiation from the well-studied Helix Nebula (NGC 7293) a mere 700 light-years away in the constellation Aquarius. The two light-year diameter shroud of dust and gas around a central white dwarf has long been considered an excellent example of a planetary nebula, representing the final stages in the evolution of a sun-like star. But the Spitzer data show the nebula's central star itself is immersed in a surprisingly bright infrared glow. Models suggest the glow is produced by a dust debris disk. Even though the nebular material was ejected from the star many thousands of years ago, the close-in dust could be generated by collisions in a reservoir of objects analogous to our own solar system's Kuiper Belt or cometary Oort cloud. Formed in the distant planetary system, the comet-like bodies would have otherwise survived even the dramatic late stages of the star's evolution.

If you are a digger please respect the submit enough to use a description. There is now no reason not to, you have it already. http://apod.nasa.gov/apod/ap091231.html