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STELLAR CHEMISTRY
Cool, New Views of Andromeda Galaxy
by Staff Writers
Pasadena CA (JPL) Feb 01, 2013


The ring-like swirls of dust filling the Andromeda galaxy stand out colorfully in this new image from the Herschel Space Observatory, a European Space Agency mission with important NASA participation. Image credit: ESA/NASA/JPL-Caltech/NHSC. For a larger version of this image please go here.

Two new eye-catching views from the Herschel space observatory are fit for a princess. They show the elegant spiral galaxy Andromeda, named after the mythical Greek princess known for her beauty.

The Andromeda galaxy, also known as Messier 31, lies 2 million light-years away, and is the closest large galaxy to our own Milky Way. It is estimated to have up to one trillion stars, whereas the Milky Way contains hundreds of billions. Recent evidence suggests Andromeda's overall mass may in fact be less than the mass of the Milky Way, when dark matter is included.

Herschel, a European Space Agency mission with important NASA contributions, sees the longer-wavelength infrared light from the galaxy, revealing its rings of cool dust. Some of this dust is the very coldest in the galaxy -- only a few tens of degrees above absolute zero.

In both views, warmer dust is highlighted in the central regions by different colors. New stars are being born in this central, crowded hub, and throughout the galaxy's rings in dusty knots. Spokes of dust can also be seen between the rings.

One view, seen here, is a mosaic of data from Herschel's Photodetecting Array Camera and Spectrometer (PACS) and spectral and photometric imaging receiver (SPIRE).

The second view, seen here, shows data from only the SPIRE instrument, which captures the longest of wavelengths detectable by Herschel.

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Related Links
Herschel at Caltech
Herschel at NASA
Herschel at ESA
Stellar Chemistry, The Universe And All Within It






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