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New Views of Andromeda Galaxy
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.Source: jpl.nasa.gov
Images: 1 - 2.
(via science-junkie)