Sistema Solar

Gypsum crystals on Mars hint at standing water far more recently than models allow

A new analysis of data from China's Zhurong rover, led by Jiacheng Liu (University of Hong Kong), has identified selenite crystals — a form of gypsum that grows only in standing salty water — in Utopia Planitia. The ground where they formed is roughly 757 million years old, hundreds of millions of years more recent than most models allow for liquid water on the Martian surface. The team proposes volcanically melted underground brine, trapped and concentrated at the surface, as the source. Published in Nature Astronomy.

Nuevos

Water and dust survive half a light-year from the Milky Way’s black hole, Webb finds

Using JWST's Mid-Infrared Instrument, a team led by Florian Peißker (University of Cologne) has detected oxygen-rich silicate dust and, for the first time, water in the envelope of the dying star IRS 3 — just 0.55 light-years from Sagittarius A*, the Milky Way's central black hole. The first continuous mid-infrared spectrum of the star reveals that evolved stars can keep enriching even the galaxy's harshest environments with material for future stars and planets. Published in Astronomy & Astrophysics.

Una enana blanca ultramasiva del tamaño de media Tierra escondería un raro núcleo de oxígeno y neón

Astrónomos liderados por Stefan M. Arseneau (Boston University) han hallado evidencia de que una de las enanas blancas más masivas conocidas, SDSS J0608−0059 — con 1,226 masas solares en un radio de media Tierra —, esconde un raro núcleo de oxígeno y neón en lugar del habitual de carbono y oxígeno. Al no poder observar el interior directamente, el equipo usó el corrimiento al rojo gravitacional para pesar la estrella y favoreció el núcleo O/Ne con un factor de Bayes de 2,7.

Cosmología

Exploración Espacial

Coreanos fotografiaron el sitio exacto en la Luna donde SpaceX contaminó con chatarra espacial, Musk guarda silencio

El orbitador lunar surcoreano Danuri ha capturado imágenes del antes y el después del cráter que una etapa superior de un Falcon 9 de SpaceX excavó al estrellarse contra la Luna el 5 de agosto de 2026. El cuerpo del cohete, de 4.000 kg, impactó a unos 8.690 km/h formando un cráter de hasta 27 metros. La agencia coreana KARI realizó ocho pasadas sobre el sitio, y desde España se habría captado el video de la eyección.
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Radioastronomía

Vida extraterrestre

Más

    El SETI Institute confirma que el cometa interestelar 3I/Atlas no porta tecnología alienígena

    El SETI Institute rastreó cerca de 74 millones de señales de radio provenientes del cometa interestelar 3I/Atlas y no encontró ninguna tecno-firma. El objeto, estimado entre 440 m y 5.6 km y posiblemente de 11 mil millones de años, es completamente natural.

    Física

    Turning the cosmic web into a detector: first limits set on dark matter decaying into gravitons

    A team led by David Dunsky (New York University) has set the first observational limits on the exotic possibility that dark matter decays into gravitons. Using the magnetic fields of the cosmic web as a natural detector, gravitons crossing these filaments could convert into gamma-ray photons via the Gertsenshtein effect — a faint glow absent from Fermi-LAT data, which constrains the decay rate across a wide range of dark matter masses. Published in Physical Review D.

    Galaxy spins retain a measurable fingerprint from the universe’s first moments

    A team led by Ming-Jie Sheng (Xiamen University) has found the clearest evidence yet that galaxy rotation carries an imprint from the universe's first moments. By reconstructing the primordial distribution of matter with the ELUCID project and comparing it to measured galaxy spins, they detected the signature of primordial tidal torques with high statistical confidence — strongest in the gas of massive elliptical galaxies — confirming a decades-old prediction and opening a possible new probe of cosmic neutrinos.

    A minority of «leaky» galaxies may have reionized the early universe, JWST spectra suggest

    A team led by Emma Giovinazzo (University of Geneva) has analyzed JWST/NIRSpec spectra of 1,428 galaxies at redshift 5 to 10 and found that cosmic reionization may have been driven by a minority of "strong leaker" galaxies. Though only about 20% of galaxies let more than 10% of their ionizing radiation escape, these produced roughly 87% of the photons that reached the intergalactic medium — enough to account for nearly all reionization by z ≈ 5.8.

    Astronomers catch «the Hatchling,» a quasar breaking out of its dusty cocoon

    A team led by Zheng Ma (Steward Observatory, University of Arizona) has identified "the Hatchling," a red quasar at redshift 3.7 caught mid-transition between a dust-buried and a fully exposed phase. Rare multiwavelength data spanning JWST, ALMA, Chandra, Hubble, MUSE and the VLA reveal a central black hole already visible while its own outflows clear the surrounding gas and dust — with a disrupted-gas halo reaching 65,000 light-years from the core.

    The largest known galaxy is still growing: ultra-deep imaging maps IC 1101’s true stellar envelope

    A team led by Carlos Marrero-de la Rosa has published the deepest images ever obtained of IC 1101, the supergiant elliptical at the center of Abell 2029, and used them to fix the galaxy's outer stellar envelope at a radius of ~260 kpc. That confirms IC 1101 as the largest known galaxy in the strict stellar sense — 1.7 million light-years across and containing about 3.4 trillion solar masses of stars — and reveals faint tidal debris that shows the record-holder is still growing.

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