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    angular momentum tagged posts

    Small Stars Share Similar Dynamics to our Sun, Key to Planet Habitability

    August 11, 2021, Categories  Astronomy/Space

    A graphic depicting stellar and planetary magnetic activity
    Rice University scientists have shown that “cool” stars like the sun share dynamic surface behaviors that influence their energetic and magnetic environments. Stellar magnetic activity is key to whether a given star can host planets that support life. (Credit: NASA)

    Stars scattered throughout the cosmos look different, but they may be more alike than once thought, according to Rice University researchers.

    New modeling work by Rice scientists shows that “cool” stars like the sun share the dynamic surface behaviors that influence their energetic and magnetic environments. This stellar magnetic activity is key to whether a given star hosts planets that could support life.

    The work by Rice postdoctoral researcher Alison Farrish and astrophysicists David Alexander and Christopher ...

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    Shedding Light on Galaxies’ Rotation Secrets

    July 14, 2017, Categories  Astronomy/Space

    Image: . Angular Momentum of Early- and Late-type Galaxies: Nature or Nurture? The Astrophysical Journal, 2017; 843 (2): 105 DOI: 10.3847/1538-4357/aa7893

    Image: . Angular Momentum of Early- and Late-type Galaxies: Nature or Nurture? The Astrophysical Journal, 2017; 843 (2): 105 DOI: 10.3847/1538-4357/aa7893

    The dichotomy concerns the so-called angular momentum (per unit mass), that in physics is a measure of size and rotation velocity. Spiral galaxies are found to be strongly rotating, with an angular momentum higher by a factor of about 5 than ellipticals. What is the origin of such a difference? An international research team investigated the issue in a study just published in the Astrophysical Journal. The team was led by SISSA Ph.D. student JingJing Shi under the supervision of Prof. Andrea Lapi and Luigi Danese, and in collaboration with Prof. Huiyuan Wang from USTC (Hefei) and Dr. Claudia Mancuso from IRA-INAF (Bologna). The res...
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    New Theory to explain why Sun’s Surface Rotates Slower than its Core

    February 6, 2017, Categories  Astronomy/Space

    The Sun by the Atmospheric Imaging Assembly of NASA's Solar Dynamics Observatory. Credit: NASA

    The Sun by the Atmospheric Imaging Assembly of NASA’s Solar Dynamics Observatory. Credit: NASA

    A team with the University of Hawaii, Ponta Grossa State University in Brazil and Stanford University has found what they believe is the reason that the surface of the sun rotates more slowly than its core. They used a new technique to measure the speed of the sun’s rotation at different depths and what it revealed about the speed of the sun’s outer 70km deep skin. Scientists have known that the surface of the sun spins more slowly than its interior but have no good explanation for it. In this new effort, the researchers were able to take a better look at what was occurring and by doing so discovered what they believe is the source of the slowdown.

    To gain a better understanding of what is happen...

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    Astronomers Shed Light on Different Galaxy Types

    September 15, 2016, Categories  Astronomy/Space

    Galaxies of Stephan's Quintet in the constellation Pegasus, observed by the Hubble Space Telescope. Credit: NASA, ESA, and the Hubble SM4 ERO Team.

    Galaxies of Stephan’s Quintet in the constellation Pegasus, observed by the Hubble Space Telescope. Credit: NASA, ESA, and the Hubble SM4 ERO Team.

    Australian scientists have taken a critical step towards understanding why different types of galaxies exist throughout the Universe. The research, made possible by cutting-edge instrumentation, means that astronomers can now classify galaxies according to their physical properties rather than human interpretation of a galaxy’s appearance. For the past 100 years, telescopes have been capable of observing galaxies beyond our own galaxy, the Milky Way.

    In 1926,Edwin Hubble refined a system that classified galaxies into categories of spiral, elliptical, lenticular or irregular shape...

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