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Spitzer California Nebula Mosaic

April 17, 2020
NASA's Spitzer Space Telescope took this image of the California Nebula on Jan. 25, 2020, five days before the spacecraft was decommissioned.

click here for larger version of figure A for PIA23650
Figure A

click here for larger version of figure B for PIA23650
Figure B

Click on images for larger versions

This series of image taken by NASA's Spitzer Space Telescope on Jan. 25, 2020, shows part of the California Nebula, which is located about 1,000 light-years from Earth. This is the final mosaic taken by the mission before it was decommissioned on Jan. 30, 2020.

Spitzer's infrared detectors reveal the presence of warm dust, similar to soot, mixed in with the gas. The dust absorbs visible and ultraviolet light from nearby stars and then re-emits the absorbed energy as infrared light.

The image displays Spitzer's observations much the way that research astronomers would view them: From 2009 to 2020, Spitzer operated two detectors simultaneously that imaged adjacent areas of the sky. The detectors captured different wavelengths of infrared light (referred to by their physical wavelength): 3.6 micrometers (shown in cyan) and 4.5 micrometers (shown in red). Different wavelengths of light can reveal different objects or features. Spitzer would scan the sky, taking multiple pictures in a grid pattern, so that both detectors would image the region at the center of the grid. By combining those images into a mosaic, it was possible to see what a given region looked like in multiple wavelengths, such as in the gray-hued part of the image above.

Figure A shows the section of the nebula captured by Spitzer in the context of a larger, visible-light image of the nebula.

Figure B shows the location of a background galaxy with clearly defined spiral arms. The galaxy is circled in red.

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate, Washington. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology, also in Pasadena. Caltech manages JPL for NASA.

More information on Spitzer can be found at its website:

http://www.spitzer.caltech.edu/

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  • Spitzer Space Telescope
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NASA/JPL-Caltech/Palomar Digitized Sky Survey

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