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    A Black Hole as light as 40 tons can exist inside a star if dark matter helps

    September 7, 2026, Categories  Astronomy/Space

    A black hole as light as 40 tons can exist inside a star if dark matter helps
    Schematic illustration of the competing processes governing the evolution of an endoparasitic black hole (EBH) inside a compact star. The EBH simultaneously accretes baryonic matter from the stellar medium (black arrows) and captured dark-matter particles (blue arrows), while losing mass through Hawking radiation (red arrows). The three panels illustrate the possible regimes: (a) accretion dominates and the EBH grows, (b) accretion and Hawking evaporation balance and the EBH remains at approximately constant mass, and (c) Hawking evaporation dominates and the EBH shrinks and ultimately evaporates. The relative number of arrows schematically represents the balance between the corresponding mass-flow rates. In case (b), EBH can have a mass as small as 40 metric tons. Credit: H. A. Adarsha
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    Stars Travel More Slowly at Milky Way’s Edge

    January 28, 2024, Categories  Astronomy/Space

    Physicists discovered stars near the edge of the Milky Way travel more slowly than those closer to its center — a surprise suggesting our galaxy’s gravitational core may have less dark matter than previously thought.

    By clocking the speed of stars throughout the Milky Way galaxy, MIT physicists have found that stars further out in the galactic disk are traveling more slowly than expected compared to stars that are closer to the galaxy’s center. The findings raise a surprising possibility: The Milky Way’s gravitational core may be lighter in mass, and contain less dark matter, than previously thought.

    The new results are based on the team’s analysis of data taken by the Gaia and APOGEE instruments...

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