Credit: X-ray: NASA/CXO/UMass/Z. Li & Q.D. Wang, ESA/XMM-Newton; Infrared: NASA/JPL-Caltech/WISE, Spitzer, NASA/JPL-Caltech/K. Gordon (U. Az), ESA/Herschel, ESA/Planck, NASA/IRAS, NASA/COBE; Radio: NSF/GBT/WSRT/IRAM/C. Clark (STScI); Ultraviolet: NASA/JPL-Caltech/GALEX; Optical: Andromeda, Unexpected © Marcel Drechsler, Xavier Strottner, Yann Sainty & J. Sahner, T. Kottary. Composite image processing: L. Frattare, K. Arcand, J.Major
Many Views of Andromeda
Sometimes a little distance can provide a little clarity. It's difficult, for example, for us to get a complete view of our own Milky Way Galaxy since we're embedded within it, and some parts of the Galaxy are hidden from our direct view. So in some ways our best view of the Milky Way comes by studying nearby external spiral galaxies. Fortunately, one of our galactic neighbors is M31, the Andromeda galaxy. M31 is close enough that you can view it with the unaided eye from a suitably dark site. But M31 is distant enough (about 2.5 million light years) you need a powerful telescope really study it (or, more accurately, study it as it was 2.5 million years ago). And to really study it you want to view the galaxy over as wide a band of the electromagnetic spectrum as possible: X-rays to study the populations of accreting black holes, neutron stars, normal stars, and supernova remnants, UV and optical to study normal stars, infrared and radio to study clouds of gas and dust and how they interact with Andromeda's magnetic field.
The image above is a multi-wavelength composite image of the Andromeda galaxy from some of the world's most powerful telescopes, including X-ray images from the Chandra X-ray Observatory and the XMM-Newton X-ray telescope (represented in red, green, and blue); ultraviolet data from GALEX (blue); optical data from astrophotographers using ground based telescopes; infrared data from the Spitzer Space Telescope, the Infrared Astronomy Satellite, COBE, and the Planck and Herschel satellite observatories (red, orange, and purple), and data from the Westerbork Synthesis Radio Telescope (in red-orange). And, for added interest, this electromagnetic symphony can be converted to sound waves - go take a listen to the sounds of Andromeda.
Published: April 13, 2026
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Page Author: Dr. Michael F. Corcoran
Last modified Monday, 13-Apr-2026 13:21:19 EDT