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    Category Astronomy/Space

    NASA’s Webb Telescope reveals Links between Galaxies Near and Far

    January 10, 2023, Categories  Astronomy/Space

    A trio of faint objects (circled) captured in the James Webb Space Telescope’s deep image of the galaxy cluster SMACS 0723 exhibit properties remarkably similar to rare, small galaxies called “green peas” found much closer to home. The cluster’s mass makes it a gravitational lens, which both magnifies and distorts the appearance of background galaxies. We view these early peas as they existed when the universe was about 5% its current age of 13.8 billion years. The farthest pea, at left, contains just 2% the oxygen abundance of a galaxy like our own and might be the most chemically primitive galaxy yet identified.
    Credit: NASA, ESA, CSA, and STScI

    A new analysis of distant galaxies imaged by NASA’s James Webb Space Telescope shows that they are extremely young and share some rem...

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    James Webb Telescope reveals Milky Way-like Galaxies in Young Universe

    January 10, 2023, Categories  Astronomy/Space

    Comparison of same galaxy imaged by Hubble Space Telescope and by James Webb Space Telescope
    The power of JWST to map galaxies at high resolution and at longer infrared wavelengths than Hubble allows it look through dust and unveil the underlying structure and mass of distant galaxies. This can be seen in these two images of the galaxy EGS23205, seen as it was about 11 billion years ago. In the HST image (left, taken in the near-infrared filter), the galaxy is little more than a disk-shaped smudge obscured by dust and impacted by the glare of young stars, but in the corresponding JWST mid-infrared image (taken this past summer), it’s a beautiful spiral galaxy with a clear stellar bar. Credit: NASA/CEERS/University of Texas at Austin

    New images from NASA’s James Webb Space Telescope (JWST) reveal for the first time galaxies with stellar bars — elongated features of stars stre...

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    Microwave Imaging of Quasi-Periodic Pulsations at Flare Current Sheet

    January 5, 2023, Categories  Astronomy/Space

     Microwave emissions from the flare. The upper group is from flaring loops, and the lower group extends along reconnection current sheet. The background is an EUV image at 211 A. The gold curve represents the temporal variation curve of current sheet source at 8.4 GHz.

    Quasi-periodic pulsations (QPPs; also known as quasi-periodic oscillations, i.e., QPOs) are electromagnetic emission phenomena that vary quasi-periodically with time. They appear in celestial transient events with different temporal/spatial scales, such as stellar flares, gamma ray bursts and fast radio bursts.

    The sun, an ordinary star closest to us, is a place where flares with QPPs appear frequently...

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    Hubble finds that Ghost Light among Galaxies Stretches Far Back in Time

    January 5, 2023, Categories  Astronomy/Space

    These are Hubble Space Telescope images of two massive clusters of galaxies named MOO J1014+0038 (left panel) and SPT-CL J2106-5844 (right panel). The artificially added blue color is translated from Hubble data that captured a phenomenon called intracluster light. This extremely faint glow traces a smooth distribution of light from wandering stars scattered across the cluster. Billions of years ago the stars were shed from their parent galaxies and now drift through intergalactic space.
    Credits: NASA, ESA, STScI, James Jee (Yonsei University); Image Processing: Joseph DePasquale (STScI)

    In giant clusters of hundreds or thousands of galaxies, innumerable stars wander among the galaxies like lost souls, emitting a ghostly haze of light...

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