A Deeper Look at Andromeda
Launched in 2003 and managed by NASA’s Jet Propulsion Laboratory, Spitzer studied the universe in infrared light, which is invisible to human eyes. Different wavelengths reveal different features of Andromeda, including hotter sources of light, like stars, and cooler sources, like dust.
By separating these wavelengths and looking at the dust alone, astronomers can see the galaxy’s “skeleton” — places where gas has coalesced and cooled, sometimes forming dust, creating conditions for stars to form. This view of Andromeda revealed a few surprises. For instance, although it is a spiral galaxy like the Milky Way, Andromeda is rather than distinct arms circling its center. The images also revealed a secondary hole in one portion of the ring where a dwarf galaxy passed through.
Andromeda’s proximity to the Milky Way means it looks larger than other galaxies from Earth: Seen with the naked eye, Andromeda would be about six times the width of the Moon (). Even with a field of view wider than Hubble’s, Spitzer had to take 11,000 snapshots to create this comprehensive picture of Andromeda.
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More About the Mission
JPL managed the Spitzer Space Telescope mission for NASA’s Science Mission Directorate in Washington until the mission was retired in January 2020. Science operations were conducted at the Spitzer Science Center at Caltech. Spacecraft operations were based at Lockheed Martin Space in Littleton, Colorado. Data are archived at the Infrared Science Archive operated by IPAC at Caltech. Caltech manages JPL for NASA.
For more information about Spitzer, visit:
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