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Chandra confirma que CTA 1 puede acelerar partículas hasta el petaelectronvoltio

El observatorio de rayos X Chandra de la NASA revela que la nebulosa de viento de púlsar en el remanente CTA 1 es capaz de acelerar electrones hasta 0.3 petaelectronvoltios, con un campo magnético sorprendentemente débil y una geometría interna de chorro y toro que nunca había sido caracterizada con esta precisión.

Pulsars could help weigh the Milky Way’s neighboring dwarf galaxies

A new study suggests that pulsars can act as cosmic accelerometers, revealing tiny gravitational disturbances caused by dwarf galaxies orbiting the Milky Way. The method could open a new way to weigh satellite galaxies and map dark matter around our galaxy.

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    Young universe, mature galaxy: JWST detects a stellar bar where theory says none can exist

    JWST has detected a mature stellar bar inside GN20, a massive, gas-rich galaxy at redshift 4. The finding directly challenges the premise that gas suppresses bar formation and forces a revision of the standard models of galaxy evolution.

    Friedmann spacetimes are unstable solutions — and that may rule out the standard model of the universe

    Mathematicians at UC Davis have published formal proof that the Friedmann spacetimes underpinning the standard cosmological model are inherently unstable solutions of the Einstein-Euler equations — with major consequences for dark energy and the Lambda-CDM model.

    Fast radio bursts are now hunting the black holes nobody has ever seen

    A new arXiv study uses gravitational microlensing signatures in the CHIME/FRB catalogue to identify two unconfirmed intermediate mass black hole candidates with masses between 539 and 2,571 solar masses, possibly primordial in nature.

    Active supermassive black holes can strip exoplanet atmospheres across entire galaxies

    A new study in The Astrophysical Journal led by Jourdan Waas shows that the supermassive black hole at the center of a galaxy can render exoplanets uninhabitable thousands of light-years away. When actively feeding, these black holes launch ultrafast outflows traveling at roughly one-tenth the speed of light, capable of heating planetary atmospheres, accelerating mass loss, and triggering near-complete ozone depletion across galactic scales. The effect scales with black hole mass: for supermassive black holes above one hundred million solar masses, ozone loss approaches 100% across most of the host galaxy, redrawing the boundaries of the galactic habitable zone and confining surface life to oceans, if it survives at all. 🌌🕳️🪐

    A symplectic Python integration of the Friedmann equations recovers the age of the Universe to within 0.1 per cent of Planck 2018

    European Journal of Physics, the journal of the Institute of Physics and the European Physical Society, publishes today a paper by a team affiliated with the Master's Programme in Astrophysics and Astronomy at UNIR, led by Homer Dávila Gutiérrez, FRAS. The work implements the Friedmann equations in Python using a symplectic Störmer-Verlet integrator and recovers the age of the Universe to within 0.1 per cent of the Planck 2018 value, while comparing seven distinct dark-energy regimes in a single integration framework. Open access.

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