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Infrared view of the Andromeda galaxy - Infrared view of the Andromeda galaxy - This...

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PIX4608960
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Infrared view of the Andromeda galaxy - Infrared view of the Andromeda galaxy - This image shows the difference in infrared radiation between the light emitted by the aged stars (blue) and that emitted by the dust (star-forming zone, red). By measuring the infrared radiation emitted by a galaxy, more or less important depending on the nature of the stars, the mass of that galaxy can be reduced. According to this method, the mass of stars in the Andromede galaxy would be 110 billion times that of the Sun, which means that this galaxy would have 1 trillion stars (our galaxy had 400 billion). In this image we distinguish the two satellite galaxies of Andromede, M32 at the bottom and NGC 205 (M110) at the top. Infrared composite at the following wavelengths: 3.6 and 4.5 microns: sensitive to star light (blue and green), and 8 micron sensitive to dust in red. 3000 different poses obtained by the Spitzer space telescope in January and August 2005 were required to achieve this complete view of the galaxy. This infrared composite image from Nasa's Spitzer Space Telescope shows the Andromeda galaxy, a neighbor to our Milky Way galaxy. The image highlights the contrast between the galaxy's choppy waves of dust (red) and smooth sea of older stars (blue). Spiral galaxies tend to form new stars in their dusty, clumpy arms, while their cores are populated by older stars.The Spitzer view also shows Andromeda's dust lanes twisting all the way into the center of the galaxy, a region that is crammed full of stars. In visible - light pictures, this central region tends to be dominated by starlight. Astronomers used these new images to measure the total infrared brightness of Andromeda. Because the amount of infrared light given off by stars depends on their masses, the brightness measurements provided a novel method for “” weighing””” the Andromeda galaxy. According to this method, the mass of the stars in
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Infrared view of the Andromeda galaxy - Infrared view of the Andromeda galaxy - This image shows the difference in infrared radiation between the light emitted by the aged stars (blue) and that emitted by the dust (star-forming zone, red). By measuring the infrared radiation emitted by a galaxy, more or less important depending on the nature of the stars, the mass of that galaxy can be reduced. According to this method, the mass of stars in the Andromede galaxy would be 110 billion times that of the Sun, which means that this galaxy would have 1 trillion stars (our galaxy had 400 billion). In this image we distinguish the two satellite galaxies of Andromede, M32 at the bottom and NGC 205 (M110) at the top. Infrared composite at the following wavelengths: 3.6 and 4.5 microns: sensitive to star light (blue and green), and 8 micron sensitive to dust in red. 3000 different poses obtained by the Spitzer space telescope in January and August 2005 were required to achieve this complete view of the galaxy. This infrared composite image from Nasa's Spitzer Space Telescope shows the Andromeda galaxy, a neighbor to our Milky Way galaxy. The image highlights the contrast between the galaxy's choppy waves of dust (red) and smooth sea of older stars (blue). Spiral galaxies tend to form new stars in their dusty, clumpy arms, while their cores are populated by older stars.The Spitzer view also shows Andromeda's dust lanes twisting all the way into the center of the galaxy, a region that is crammed full of stars. In visible - light pictures, this central region tends to be dominated by starlight. Astronomers used these new images to measure the total infrared brightness of Andromeda. Because the amount of infrared light given off by stars depends on their masses, the brightness measurements provided a novel method for “” weighing””” the Andromeda galaxy. According to this method, the mass of the stars in

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Photo © NASA/JPL/Caltech/Novapix / Bridgeman Images
Image keywords
astronomy / star / infrared / composite / astronomy / galaxy / spiral galaxy / 2006 / 2005 / m32 / mail / star / Novapix / astronomy / infrared / star formation / Star Training / spitzer space telescope / galaxy / andromeda / andromede / Galaxy Spiral / m31 / Ngc 224 / M110 / ngc 205 / ngc 221

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