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Spitzer Turns Two
Pasadena CA (JPL) Aug 26, 2005 Two years ago today, NASA's Spitzer Space Telescope blasted into the same dark skies it now better understands. In just two years, the observatory's infrared eyes have uncovered a hidden universe teeming with warm stellar embryos, chaotic planet-forming disks and majestic galaxies, including the delightfully odd galaxy called NGC 4725 shown here. This peculiar galaxy is thought to have only one spiral arm. Most spiral galaxies have two or more arms. Astronomers refer to NGC 4725 as a ringed barred spiral galaxy because a prominent ring of stars encircles a bar of stars at its center (the bar is seen here as a horizontal ridge with faint red features). Our own Milky Way galaxy sports multiple arms and a proportionally smaller bar and ring. In this false-color Spitzer picture, the galaxy's arm is highlighted in red, while its center and outlying halo are blue. Red represents warm dust clouds illuminated by newborn stars, while blue indicates older, cooler stellar populations. The red spokes seen projecting outward from the arm are clumps of stellar matter that may have been pushed together by instable magnetic fields. NGC 4725 is located 41 million light-years away in the constellation Coma Berenices. This picture is composed of four images taken by Spitzer's infrared array camera at 3.6 (blue), 4.5 (green), 5.8 (red), and 8.0 (red) microns. The contribution from starlight (measured at 3.6 microns) has been subtracted from the 5.8- and 8-micron images to enhance the visibility of the dust features. Community Email This Article Comment On This Article Related Links Spitzer At Caltech SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express Space Telescope News and Technology at Skynightly.com
Carl Zeiss And Max Planck Researchers Develop Optical Technology For JWST
Heidelberg, Germany (SPX) Dec 09, 2005Carl Zeiss Optronics, in Oberkochen, Germany, and the Max Planck Institute for Astronomy in Heidelberg (MPIA), are developing the main fine mechanical optical technology for two instruments to be part of the James Webb Space Telescope (JWST).
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