Ngc 7293, Caldwell 63, Helix Nebula #1
by Science Source
Title
Ngc 7293, Caldwell 63, Helix Nebula #1
Artist
Science Source
Medium
Photograph - Photograph
Description
The Helix nebula exhibits complex structure on the smallest visible scales. It is composed of gaseous shells and disks puffed out by a dying sun-like star. In this new image from NASA's Spitzer Space Telescope, "cometary knots" show blue-green heads caused by excitation of their molecular material from shocks or ultraviolet radiation. The tails of the cometary knots appear redder due to being shielded from the central star's ultraviolet radiation and wind by the heads of the knots. This image was captured by the telescope's infrared array camera. The false color composite depicts wavelengths of 3.6 microns (blue), 4.5 microns (green), and 8.0 microns (red). The color saturation has been increased to intensify hues.
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August 14th, 2014
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