pictures-of-space The Two-faced Whirlpool Galaxy NASA image release January 13 2011 In the image here most of the starlight has been removed revealing the Whirlpool’s skeletal dust structure as seen in near-infrared light This new image is the sharpest view of the dense dust in M51 The narrow lanes of dust revealed by Hubble reflect the galaxy’s moniker the Whirlpool Galaxy as if they were swirling toward the galaxy’s core To map the galaxy’s dust structure researchers collected the galaxy’s starlight by combining images taken in visible and near-infrared light The visible-light image captured only some of the light the rest was obscured by dust The near-infrared view however revealed more starlight because near-infrared light penetrates dust The researchers then subtracted the total amount of starlight from both images to see the galaxy’s dust structure The red color in the near-infrared image traces the dust which is punctuated by hundreds of tiny clumps of stars each about 65 light-years wide These stars have never been seen before The star clusters cannot be seen in visible light because dense dust enshrouds them The image reveals details as small as 35 light-years across Astronomers expected to see large dust clouds ranging from about 100 light-years to more than 300 light-years wide Instead most of the dust is tied up in smooth and diffuse dust lanes An encounter with another galaxy may have prevented giant clouds from forming Probing a galaxy’s dust structure serves as an important diagnostic tool for astronomers providing invaluable information on how the gas and dust collapse to form stars Although Hubble is providing incisive views of the internal structure of galaxies such as M51 the planned James Webb Space Telescope JWST is expected to produce even crisper images Researchers constructed the image by combining visible-light exposures from Jan 18 to 22 2005 with the Advanced Camera for Surveys ACS and near-infrared light pictures taken in December 2005 with the Near Infrared Camera and Multi-Object Spectrometer NICMOS Credit NASA ESA S Beckwith STScI and the Hubble Heritage Team STScIAURA Meme

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