Fitxategi:The Infrared Andromeda Galaxy (M31).jpg
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DeskribapenaThe Infrared Andromeda Galaxy (M31).jpg |
English: This infrared composite image from NASA's Spitzer Space Telescope shows the Andromeda galaxy, a neighbor to our Milky Way galaxy. The main image (top) highlights the contrast between the galaxy's choppy waves of dust (red) and smooth sea of older stars (blue). The panels below the main image show the galaxy's older stars (left) and dust (right) separately. 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 Andromeda is about110 billion times that of the sun, which is in agreement with past calculations. This means the galaxy contains about one trillion stars (because most stars are actually less massive than the sun). For comparison, the Milky Way is estimated to hold about 400 billion stars. A small, companion galaxy called NGC 205 is visible above Andromeda. Another companion galaxy called M32 can also been seen below the galaxy. The Andromeda galaxy, also known as Messier 31, is located 2.5 million light-years away in the constellation Andromeda. It is the closest major galaxy to the Milky Way, making it the ideal specimen for carefully examining the nature of galaxies. On a clear, dark night, the galaxy can be spotted with the naked eye as a fuzzy blob. Andromeda's entire disk spans about 260,000 light-years, which means that a light beam would take 260,000 years to travel from one end of the galaxy to the other. By comparison, the Milky Way is about 100,000 light-years across. When viewed from Earth, Andromeda occupies a portion of the sky equivalent to seven full moons. Because this galaxy is so large, the infrared images had to be stitched together out of about 3,000 separate Spitzer exposures. The light detected by Spitzer's infrared array camera at 3.6 and 4.5 microns is sensitive mostly to starlight and is shown in blue and green, respectively. The 8-micron light shows warm dust and is shown in red. The contribution from starlight has been subtracted from the 8-micron image to better highlight the dust structures. |
Data | |
Jatorria | http://www.spitzer.caltech.edu/images/1630-ssc2006-14a-Andromeda-Makes-a-Splash |
Egilea | NASA/JPL-Caltech/P. Barmby (Harvard-Smithsonian CfA) |
Image use policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy
Lizentzia
Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
Warnings:
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Fitxategi honetan agertzen diren itemak
honako hau irudikatzen du
5 ekaina 2006
media type ingelesa
image/jpeg
Fitxategiaren historia
Data/orduan klik egin fitxategiak orduan zuen itxura ikusteko.
Data/Ordua | Iruditxoa | Neurriak | Erabiltzailea | Iruzkina | |
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oraingoa | 18:08, 20 ekaina 2011 | 6.000 × 4.800 (18,58 MB) | Spitzersteph |
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Metadatuak
Fitxategi honek informazio gehigarri dauka, ziurrenik kamera digital edo eskanerrak egiterako momentuan gehitutakoa. Hori dela-eta, jatorrizko fitxategi hori aldatu egin bada, baliteke xehetasun batzuek errealitatearekin bat ez egitea.
Datuen sorreraren data eta ordua | 5 ekaina 2006 |
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Zabalera | 6.000 px |
Altuera | 4.800 px |
Bit osagaiko |
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Konpresio eskema | LZW |
Pixelen konposaketa | GBU (RGB) |
Irudiaren izenburua |
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Orientazioa | Arrunta |
Atal kopurua | 3 |
Bereizmen horizontala | 300 dpi |
Bereizmen bertikala | 300 dpi |
Datuen banaketa | formatu potoloa |
Erabilitako softwarea | Adobe Photoshop CS3 Macintosh |
Fitxategi aldaketaren data eta ordua | 14:48, 5 ekaina 2009 |
Egilea | Spitzer Space Telescope |
Copyright-aren jabea | http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
Kolore tartea | Kalibratu gabe |
Kontratuaren informazioa |
http://www.spitzer.caltech.edu 1200 E. California Blvd. Pasadena, CA, 91125 USA |
Hitz gakoak |
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Izenburua laburra |
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Kreditua/Emalea | NASA/JPL-Caltech/P. Barmby (Harvard-Smithsonian CfA) |
Goiburua | This infrared composite image from NASA's Spitzer Space Telescope shows the Andromeda galaxy, a neighbor to our Milky Way galaxy. The main image (top) highlights the contrast between the galaxy's choppy waves of dust (red) and smooth sea of older stars (blue). The panels below the main image show the galaxy's older stars (left) and dust (right) separately. Spiral galaxies tend to form new stars in their dusty, clumpy arms, while their cores are populated by older stars. |
Jatorria | Spitzer Space Telescope |
Erabilera baldintzak |
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IIM bertsioa | 2 |