Physics

  1. illustration of light swirling around a black hole
    Space

    The first black hole image helped test general relativity in a new way

    The Event Horizon Telescope’s iconic image of the black hole at the center of galaxy M87 once again shows Einstein was right.

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  2. water molecule illustration
    Physics

    A stop-motion experiment reveals supercooled water’s dual nature

    Scientists found signs that water cooled well below freezing consists of two different arrangements of molecules.

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  3. EHT M87 black hole image
    Space

    EHT data show turbulence makes the glowing ring around M87’s black hole wobble

    Event Horizon Telescope data spanning nearly a decade reveal that the appearance of the supermassive black hole inside galaxy M87 changes over time.

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  4. image of a sea butterfly on a black background
    Animals

    Sea butterflies’ shells determine how the snails swim

    New aquarium videos show that sea butterflies of various shapes and sizes flutter through water differently.

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  5. toy boats floating right side up and upside down
    Physics

    Toy boats float upside down underneath a layer of levitated liquid

    The upward force of buoyancy keeps objects afloat even in unusual conditions.

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  6. Colliding black hole illustration
    Physics

    Record-breaking gravitational waves reveal that midsize black holes do exist

    The biggest merger of two black holes so far raises questions about how the pair of objects came to be.

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  7. positronium with an electron in blue and a positron in red
    Quantum Physics

    A measurement of positronium’s energy levels confounds scientists

    A gap in the energy levels of positronium seems to be substantially larger than predicted, and physicists don’t know why.

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  8. blue whirl flame
    Physics

    Four types of flames join forces to make this eerie ‘blue whirl’

    Pinning down the structure of the “amazingly complex” blaze could help scientists control it.

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  9. ice cube
    Physics

    A new experiment hints at how hot water can freeze faster than cold

    A study of tiny glass beads suggests that the Mpemba effect is real.

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  10. atomic bomb explosion at Hiroshima
    Physics

    How understanding nature made the atomic bomb inevitable

    On the anniversary of Hiroshima, here’s a look back at the chain reaction of basic discoveries that led to nuclear weapons.

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  11. illustration of sperm
    Health & Medicine

    Human sperm don’t swim the way that anyone had thought

    High-speed 3-D microscopy and mathematical analyses reveal that rolling and lopsided tail flicks keep the cells swimming in a straight line.

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  12. Large solar flare
    Physics

    The physics of solar flares could help scientists predict imminent outbursts

    Physicists aim to improve space weather predictions by studying the physical processes that spark a solar flare.

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