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11 stories from Planck Standard. Latest: August 9, 2026.
Tidal torque theory says a galaxy's rotation was set before the galaxy existed, by uneven gravity tugging on the clump of matter that became it. A Xiamen University team reconstructed the primordial density field and found the fingerprint intact.
Richard Feynman made the puzzle famous after his own experiments failed. A team at the Courant Institute built looping, curved sprinklers, ran them forward and backward, and found the answer in the angular momentum of the water itself.
Supercomputer simulations on Japan's ATERUI III show interstellar magnetic fields strip rotational energy from forming star pairs, letting two protostars spiral together fast enough to match what astronomers actually see.
Using terahertz laser pulses on bismuth selenide, German researchers watched angular momentum flip direction as it passed between a crystal's own vibrations — a first that could help control quantum bits.
Using terahertz lasers, researchers watched angular momentum move through crystals and found rotations can unexpectedly flip direction due to quantum symmetry effects.
Ultra-powerful terahertz lasers reveal how angular momentum transfers through crystals, with surprising reversals caused by quantum symmetry effects.
Researchers using terahertz laser pulses discover bizarre effect where atomic rotations unexpectedly reverse direction due to crystal symmetry.
Ultra-powerful terahertz lasers reveal how atomic rotations can unexpectedly flip direction as momentum transfers through quantum materials, offering new insights into magnetism's fundamental origins.
Scientists directly watch angular momentum move through crystal for first time, discovering unexpected reversal effect.
Scientists directly observe angular momentum moving through crystals for the first time, discovering bizarre reversal effect caused by quantum symmetry.
Researchers at Dresden's HZDR and Berlin's Fritz Haber Institute fired terahertz laser pulses at bismuth selenide and directly observed angular momentum being passed between atomic vibrations — with the direction of rotation flipping mid-transfer, a long-predicted 'Umklapp process.'