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Beyond the Edge of the Milky Way: Giant Pulsating Stars Revealed an Enormous Halo of Dark Matter

Beyond the Edge of the Milky Way: Giant Pulsating Stars Revealed an Enormous Halo of Dark Matter
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"Beyond the Edge of the Milky Way" --Dark Energy Probe Hints at an Enormous Invisible Halo of Dark Matter

One early result of the ongoing Dark Energy Survey is the previously untold story revealed by old, giant RR Lyrae pulsating stars, which tell scientists about the region of space beyond the edge of our Milky Way. In this area nearly devoid of stars–the motion of the RR Lyrae stars hints at the presence of an enormous halo of invisible dark matter, which may provide clues to how our galaxy evolved over the last 12 billion years.
One of the Biggest Mysteries in Science
Dark matter, one of the enduring mysteries in science, is “dark” in the sense that it doesn’t emit radiation or hardly interact with anything except via its gravitational attraction. Dark matter may be responsible for some of the observed gravitational waves signals, and seeded supermassive black holes found in the center of the Milky Way and other galaxies, according to a recent study by the Kavli Institute for the Physics and Mathematics of the Universe. ....

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Shining a New Light on Dark Energy

IMAGE:
Elliptical galaxies are generally characterized by their relatively smooth appearance when compared with spiral galaxies (one of which is to the left) which have more flocculent structure interwoven with dust.
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Credit: DES/CTIO/NOIRLab/NSF/DOE/AURA
Acknowledgments: Image processing: DES, Jen Miller (Gemini Observatory/NSF s NOIRLab), Travis Rector (University of Alaska Anchorage), Mahdi Zamani & Davide de Martin
The Dark Energy Survey has released a massive, public collection of astronomical data and calibrated images from six years of work. Containing data on nearly 700 million astronomical objects, this second data release in the Survey s seven-year history is the topic of sessions today and tomorrow at the 237th Meeting of the American Astronomical Society.[1] ....

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