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    Category Astronomy/Space

    New discovery about Distant Galaxies: Stars are more Massive than we thought

    May 31, 2022, Categories  Astronomy/Space

    New discovery about distant galaxies: Stars are heavier than we thought
    Left: best-fit temperature from 10 to 50 K vs. lookback time from a sample of 139,535 COSMOS2015 galaxies with S/N 10 in the V band (Laigle et al. 2016). At each redshift, the distribution is individually normalized in order to emphasize the temperature distribution at all redshifts. With increased redshift, fewer galaxies are fit at lower temperatures. Right: boxcar-smoothed mean with standard deviation of best-fit gas temperature at different lookback times (with mean determined from objects in 2 Gyr width age bins and not including galaxies fit at the bounds of temperature range). The mean temperature increases from ∼28 to ∼36 K from present to 12 Gyr, while the spread decreases. Credit: The European Physical Journal E (2022). DOI: 10.1140/epje/s10189-022-00183-5

    A team o...

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    How the Universe got its Magnetic Field

    May 26, 2022, Categories  Astronomy/Space, Physics

    How the universe got its magnetic field | MIT News
    Visualization of filamentary seed magnetic fields emerging from large-scale motions of unmagnetized plasma in a first-principles numerical simulation. Credit: Muni Zhou et al

    When we look out into space, all of the astrophysical objects that we see are embedded in magnetic fields. This is true not only in the neighborhood of stars and planets, but also in the deep space between galaxies and galactic clusters. These fields are weak—typically much weaker than those of a refrigerator magnet—but they are dynamically significant in the sense that they have profound effects on the dynamics of the universe. Despite decades of intense interest and research, the origin of these cosmic magnetic fields remains one of the most profound mysteries in cosmology.

    In previous research, scientist...

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    New Discovery about Distant Galaxies: Stars are Heavier than we thought

    May 26, 2022, Categories  Astronomy/Space

    New discovery about distant galaxies: Stars are heavier than we thought
    Left: best-fit temperature from 10 to 50 K vs. lookback time from a sample of 139,535 COSMOS2015 galaxies with S/N > 10 in the V band (Laigle et al. 2016). At each redshift, the distribution is individually normalized in order to emphasize the temperature distribution at all redshifts. With increased redshift, fewer galaxies are fit at lower temperatures. Right: boxcar-smoothed mean with standard deviation of best-fit gas temperature at different lookback times (with mean determined from objects in 2 Gyr width age bins and not including galaxies fit at the bounds of temperature range). The mean temperature increases from ∼28 to ∼36 K from present to 12 Gyr, while the spread decreases. Credit: The European Physical Journal E (2022). DOI: 10.1140/epje/s10189-022-00183-5

    A team of Uni...

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    Hubble reaches new Milestone in Mystery of Universe’s Expansion Rate

    May 25, 2022, Categories  Astronomy/Space

    This collection of 36 images from NASA’s Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae. These two celestial phenomena are both crucial tools used by astronomers to determine astronomical distance, and have been used to refine our measurement of the Hubble constant, the expansion rate of the universe.

    Completing a nearly 30-year marathon, NASA’s Hubble Space Telescope has calibrated more than 40 “milepost markers” of space and time to help scientists precisely measure the expansion rate of the universe — a quest with a plot twist.

    Pursuit of the universe’s expansion rate began in the 1920s with measurements by astronomers Edwin P. Hubble and Georges Lemaître...

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