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    NASA’s Fermi Detects First Gamma-Ray Eclipses from ‘Spider’ Star Systems

    January 27, 2023, Categories  Astronomy/Space

    Streams of material blow off an orange-yellow in the foreground. In the distance, a pulsar rotates like a lighthouse, emitting beams of magenta light. The background is black, purple, and speckled with stars.
    An orbiting star begins to eclipse its partner, a rapidly rotating, superdense stellar remnant called a pulsar, in this illustration. The pulsar emits multiwavelength beams of light that rotate in and out of view and produces outflows that heat the star’s facing side, blowing away material and eroding its partner.
    Credits: NASA/Sonoma State University, Aurore Simonnet

    Scientists have discovered the first gamma-ray eclipses from a special type of binary star system using data from NASA’s Fermi Gamma-ray Space Telescope. These so-called spider systems each contain a pulsar—the superdense, rapidly rotating remains of a star that exploded in a supernova—that slowly erodes its companion.

    An international team of scientists scoured over a decade of Fermi observations to find seven sp...

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