PIA03294: The Infrared Helix

The Infrared Helix


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 [ sic ] 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.

Cataloging Keywords:

Name Value Additional Values
Target Helix Nebula Sun
Target Type Comet, Sun
Mission Spitzer Telescope Spitzer Space Telescope
Instrument Host Spitzer Telescope
Host Type
Instrument Infrared Array Camera (IRAC)
Extra Keywords Color, Infrared, Ultraviolet
Acquisition Date
Release Date 2006-01-09
Date in Caption
Image Credit NASA / JPL-Caltech /Harvard-Smithsonian CfA
Source photojournal.jpl.nasa.gov/catalog/PIA03294
Identifier PIA03294