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Description

The spiral arms of the nearby galaxy Messier 81 are highlighted in this NASA Spitzer Space Telescope image. Located in the northern constellation of Ursa Major (which also includes the Big Dipper), this galaxy is easily visible through binoculars or a small telescope. M81 is located at a distance of 12 million light-years.

Because of its proximity, M81 provides astronomers with an enticing opportunity to study the anatomy of a spiral galaxy in detail. The unprecedented spatial resolution and sensitivity of Spitzer at infrared wavelengths show a clear separation between the several key constituents of the galaxy: the old stars, the interstellar dust heated by star formation activity, and the embedded sites of massive star formation. The infrared images also permit quantitative measurements of the galaxy's overall dust content, as well as the rate at which new stars are being formed.
Date
Source http://www.spitzer.caltech.edu/Media/releases/ssc2003-06/ssc2003-06c.shtml (TIFF image)
Author NASA/JPL-Caltech/S. Willner (Harvard-Smithsonian Center for Astrophysics)
Permission
(Reusing this file)
Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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6 November 2003

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Date/TimeThumbnailDimensionsUserComment
current16:14, 3 March 2010Thumbnail for version as of 16:14, 3 March 20101,358 × 1,030 (1.27 MB)TryphonRemoved border from TIFF file, then converted to JPEG, from http://www.spitzer.caltech.edu/Media/releases/ssc2003-06/ssc2003-06c.shtml (http://ipac.jpl.nasa.gov/media_images/ssc2003-06c.tif).
07:05, 30 May 2007Thumbnail for version as of 07:05, 30 May 20071,500 × 1,200 (1.11 MB)ArchetypeRyan~commonswikiThis is an image of the spiral galaxy M81 taken by the Spitzer Space Telescope and distributed by NASA. It was provided by the Spitzer Space Telescope Newsroomhttp://www.spitzer.caltech.edu/Media/releases/ssc2003-06/ssc2003-06c.shtml.

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