black hole

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    An Astrophysicist on What the Black-Hole Image Reveals

    The great irony of black holes is that, in all the decades that we astrophysicists have talked about them, we never had any direct observational evidence for them. When astronomers said they had “found black holes” in this or that location in a faraway location in the universe, what this really meant was a very […]

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    The Day Feynman Worked Out Black-Hole Radiation on My Blackboard

    After a few minutes, Richard Feynman had worked out the process of spontaneous emission, which is what Stephen Hawking became famous for a year later.Wikicommons The amazing image of a black hole unveiled Wednesday, along with data from the Event Horizon Telescope, may not substantiate Stephen Hawking’s famous theory that radiation, an example of spontaneous […]

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    How to Get Close to a Black Hole

    Want to understand the most mysterious object in the universe? Make one at home.

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    How Black Holes Nearly Ruined Time

    Quantum mechanics rescued our understanding of past and future from the black hole.

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    Where Nature Hides the Darkest Mystery of All

    There’s no boundary quite like a black hole boundary.

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    The Most Massive Object in the Universe—How Was It Created?

      The galaxy known prosaically as M87 doesn’t look like much. Unlike beautiful spiral galaxies (including the Milky Way), M87 appears as an orangish blob of stars through telescopes. Its only noticeable feature is the long streamer of gas emanating from the galactic center. The source of that jet is far from prosaic, however: It’s […]

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    Infinite Garbage Can

    Can information ever be rescued from inside a black hole?

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    Where Nature Hides the Darkest Mystery of All

      No known object in existence has as clear a division between “inside” and “outside” as a black hole. We live and see the outside, and no probe will bring us information about the inside. We can send radio messages or robotic spacecraft, but once they cross over into a black hole’s interior, we’ll never […]