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black hole

  • Most neutron stars are a mere 15 miles in diameter. That makes them about the size of a moderate city. (NASA)
    The Star That's Almost Too Massive To Exist
    Walker Rhea
    When a star burns through most of its nuclear material, it can explode in a bright supernove and leave behind a dense core. If that core is massive enough, it'll become a neutron star.
  • Our own Milky Way galaxy, shown above, hosts a black hole at its center. (Marcio de Assis, Wikimedia Commons)
    Galactic Center
    Walker Rhea
    In 2019, scientists achieved a great goal of astrophysics when they published the first-ever image of a black hole. By coordinating radio telescopes around the world to create, in effect, one Earth-sized telescope, scientists were able to capture an image of a black hole.