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Keyword: spiralgalaxy

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  • Astronomy Picture of the Day -- Massive Nearby Spiral Galaxy NGC 2841

    04/21/2014 7:43:44 AM PDT · by SunkenCiv · 5 replies
    NASA ^ | April 21, 2014 | (see photo credit)
    Explanation: It is one of the more massive galaxies known. A mere 46 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major. This sharp view of the gorgeous island universe shows off a striking yellow nucleus and galactic disk. Dust lanes, small, pink star-forming regions, and young blue star clusters are embedded in the patchy, tightly wound spiral arms. In contrast, many other spirals exhibit grand, sweeping arms with large star-forming regions. NGC 2841 has a diameter of over 150,000 light-years, even larger than our own Milky Way and captured by this...
  • Study Provides New Insights into Origin of Spiral Arms in Disk Galaxies

    04/03/2013 6:41:23 PM PDT · by SunkenCiv · 10 replies
    Sci-News ^ | April 3, 2013 | unattributed
    U.S. astrophysicists report computer simulations that seem to resolve long-standing questions about the origin and life history of spiral arms in disk galaxies. The origin and fate of the spiral arms in disk galaxies have been debated by astrophysicists for decades, with two theories predominating. One holds that the arms come and go over time. A second and widely held theory is that the material that makes up the arms – stars, gas and dust – is affected by differences in gravity and jams up, like cars at rush hour, sustaining the arms for long periods. The new findings, accepted...
  • Astronomy Picture of the Day -- Grand Spiral Galaxy NGC 7424

    01/08/2013 6:47:16 PM PST · by SunkenCiv · 10 replies
    NASA ^ | January 08, 2012 | (see photo credit)
    Explanation: The grand, winding arms are almost mesmerizing in this face-on view of NGC 7424, a spiral galaxy with a prominent central bar. About 40 million light-years distant in the headlong constellation Grus, this island universe is also about 100,000 light-years across making it remarkably similar to our own Milky Way. Following along the winding arms, many bright clusters of massive young stars can be found. The star clusters themselves are several hundred light-years in diameter. And while massive stars are born in the arms of NGC 7424, they also die there. Notably, this galaxy was home to a powerful...