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    dwarf galaxy tagged posts

    Astronomers find Evidence for most Powerful Pulsar in Distant Galaxy

    June 16, 2022, Categories  Astronomy/Space

    Version Without Labels — Top Left: A giant blue star, much more massive than our Sun, has consumed, through nuclear fusion at its center, all its hydrogen, helium, and heavier elements up to iron. It now has a small iron core (red dot) at its center. Unlike the earlier stages of fusion, the fusion of iron atoms absorbs, rather than releases, energy. The fusion-released energy that has held up the star against its own weight now is gone, and the star will quickly collapse, triggering a supernova explosion. Top Right: The collapse has begun, producing a superdense neutron star with a strong magnetic field at its center (inset). The neutron star, though containing about 1.5 times the mass of the Sun, is only about the size of Manhattan...
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    Evidence of Broadside Collision with Dwarf Galaxy discovered in Milky Way

    October 21, 2020, Categories  Astronomy/Space

    The Milky Way’s Shell Structure Reveals the Time of a Radial Collision
    Thomas Donlon II, Heidi Jo Newberg, Robyn Sanderson, Lawrence M. Widrow

    ‘Shell structures’ are first of their kind found in the galaxy. Nearly 3 billion years ago, a dwarf galaxy plunged into the center of the Milky Way and was ripped apart by the gravitational forces of the collision. Astrophysicists announced today that the merger produced a series of telltale shell-like formations of stars in the vicinity of the Virgo constellation, the first such “shell structures” to be found in the Milky Way. The finding offers further evidence of the ancient event, and new possible explanations for other phenomena in the galaxy.

    Astronomers identified an unusually high density of stars called the Virgo Overdensity about ...

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    Hubble fortuitously discovers a New Galaxy in the Cosmic MNeighborhood

    February 1, 2019, Categories  Astronomy/Space

    Astronomers using the NASA/ESA Hubble Space Telescope to study some of the oldest and faintest stars in the globular cluster NGC 6752 have made an unexpected finding. They discovered a dwarf galaxy in our cosmic backyard, only 30 million light-years away.

    An international team of astronomers recently used the NASA/ESA Hubble Space Telescope to study white dwarf stars within the globular cluster NGC 6752. The aim of their observations was to use these stars to measure the age of the globular cluster, but in the process they made an unexpected discovery.

    In the outer fringes of the area observed with Hubble’s Advanced Camera for Surveys a compact collection of stars was visible...

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    Small Blue Galaxy could Shed new light on Big Bang

    May 13, 2016, Categories  Astronomy/Space

    An image of the galaxy AGC 198691 (nicknamed Leoncino, or "little lion") taken by the Hubble Space Telescope. Credit: Photo by NASA; A. Hirschauer & J. Salzer, Indiana University; J. Cannon, Macalester College; and K. McQuinn, University of Texas

    An image of the galaxy AGC 198691 (nicknamed Leoncino, or “little lion”) taken by the Hubble Space Telescope. Credit: Photo by NASA; A. Hirschauer & J. Salzer, Indiana University; J. Cannon, Macalester College; and K. McQuinn, University of Texas

    ‘Little lion’ ie Leoncino galaxy contains lowest level of heavy elements ever detected in gravitationally bound system of stars. A faint blue galaxy about 30 million light-years from Earth and located in the constellation Leo Minor could shed new light on conditions at the birth of the universe. “Finding the most metal-poor galaxy ever is exciting since it could help contribute to a quantitative test of the Big Bang,” Salzer said...

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