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Baby Stars, Fat Stars, & Hubble

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  • tkreevesjr
    Stellar nursery in nearby galaxy teems with activity
    Message 1 of 3540 , Sep 30 7:41 PM
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      Stellar nursery in nearby galaxy teems with
      activity<br><br><a href=http://cnn.com/TECH/space/9909/29/hubble.stars/index.html target=new>http://cnn.com/TECH/space/9909/29/hubble.stars/index.html</a><br> <br>Images taken in infrared and visible light by
      NASA's Hubble Space Telescope recount a vivid story of
      the turbulent birthing process of massive stars. <br>
      <br>September 29, 1999<br>Web posted at: 2:17 p.m. EDT (1817
      GMT)<br><br><br>(CNN) -- Features of stellar birth never seen before
      are shown in Hubble space telescope images of a
      nebula where stars are sprouting like gawky suburbs
      around an urban hub. <br><br>Radiation and gases spewed
      from massive stars in the core of the nebula in the
      Large Magellanic Cloud, a satellite galaxy of our Milky
      Way, are triggering the burst of star birth, as shown
      in the infrared and visible-light images released
      Wednesday. <br><br>The nascent stars, embedded in columns of
      gas and dust are blowing away the tops of their
      nurseries, like a volcano blasting material into the sky.
      <br><br>And jets of material streaming from one developing
      star are colliding with nearby dust and gas, causing
      impressive glowing patterns in the region called the 30
      Doradus Nebula -- 170,000 light years from Earth. A light
      year is 6 trillion miles or the distance light travels
      in a year. <br><br>"This region is larger and
      contains more massive stars than any similar object in our
      galaxy," said Nolan R. Walborn of the Space Telescope
      Science Institute in Maryland. The STSI oversees the use
      of NASA's Hubble telescope as it orbits Earth.
      <br><br>The stellar action is happening relatively nearby,
      providing astronomers with a "laboratory" for studying the
      details of the birth and development of "hefty" stars and
      multiple-star systems. <br><br>"Heavy" stars key to
      process<br><br>A 2 million year-old cluster of massive stars,
      called R136, unleashed the gas and energy that created
      the star nurseries, Walborn said. <br><br>Its "heavy"
      stars have temperatures 10 times that of the sun and
      masses up to 100 times greater. They shed bubbles of
      material at speeds of thousands of miles per second, which
      collide with surrounding dense clouds of hydrogen.
      <br><br>Some of those clouds collapse, igniting
      second-generation stars, he said. Most of these new stars are less
      than a million years old. <br><br>Astronomers think
      there are thousands of fledgling stars in 30 Doradus, a
      significant fraction of the original generation of stars,
      packed into a 600-light-year-wide nebula.
      <br><br>Resembling the towers of the Eagle Nebula, columns of dust
      shown in the image are oriented toward the central star
      cluster, pointing to its role in stellar birth.
      <br><br>Radiation from some of the new stars has begun to erode
      their natal dust columns, and their emergence from the
      columns can be seen in the visible-light images.
      <br><br>Others remain completely immersed in their stellar
      incubators and can only be seen in infrared images. Many of
      them never have been seen before, Walborn said.
      <br><br>The wave of star birth will continue to migrate
      farther out in the nebula, he said, until in a few
      million years it will be a shell of glowing gas with its
      most massive stars at its periphery. <br><br>The hub
      itself will be dimmer and abandoned by the massive stars
      to which it gave birth.
    • jefftibb
      The SEDS site has a short list of Messier Marathon locations where people will congregate to count the Messier Objects. If you would like to join a
      Message 3540 of 3540 , Mar 13, 2002
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        The SEDS site has a short list of Messier
        Marathon locations where people will congregate to count
        the Messier Objects.<br><br>If you would like to join
        a group and do it check out this
        site:<br><br><a href=http://seds.lpl.arizona.edu/messier/xtra/marathon/mm2002.html target=new>http://seds.lpl.arizona.edu/messier/xtra/marathon/mm2002.html</a><br><br>Many will be happening this weekend.
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