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Astronomy and astrophysics are the study of objects and phenomena that are found beyond our solar system. This combines theoretical simulations and observation with both terrestrial and space-craft-borne instruments of the electromagnetic radiation and high-energy particles emitted by celestial bodies.
Numerical simulations provide a mechanism that explains how celestial objects such as stars and galaxies can generate ordered, macroscopic magnetic fields. The mechanism arises from turbulence — chaotic changes in the pressure and velocity of fluid — and avoids a physical effect that hinders other proposed systems from explaining observed ordered fields.
Discovery of a protocluster at z = 5.68, merely one billion years after the Big Bang, suggests that large-scale structure must have formed more rapidly in some regions of the early universe than previously thought.
Kinematic measurements of the Perseus galaxy cluster reveal two drivers of gas motions: a small-scale driver in the inner core associated with black-hole feedback and a large-scale driver in the outer core powered by mergers.
Amplification and optimal noise filtering in hyperpolarized noble-gas spins of observations from distributed intercity quantum sensors monitoring for unexpected transient rotations of polarized spins set parameter range constraints in the search for axion dark matter.
The study introduces radio interferometric multiplexed spectroscopy (RIMS), a method designed to efficiently monitor the radio emissions of massive samples of stars. Applying it to LOFAR data, the authors identify stellar bursts, offering clues to possible star–planet magnetic interactions.
Although our nearest neighbour, the Andromeda galaxy, is falling towards us, slightly more distant galaxies all move away with the cosmic expansion because they are being pulled by a giant dark matter sheet.
Numerical simulations provide a mechanism that explains how celestial objects such as stars and galaxies can generate ordered, macroscopic magnetic fields. The mechanism arises from turbulence — chaotic changes in the pressure and velocity of fluid — and avoids a physical effect that hinders other proposed systems from explaining observed ordered fields.
