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

A cosmic particle accelerator and the halo it built: the case for Cygnus X-3 behind the Cygnus Bubble

A team led by Zhaodong Shi (University of Science and Technology of China) has proposed that the microquasar Cygnus X-3 — recently confirmed as the Milky Way's first "super-PeVatron" — is the cosmic accelerator powering the mysterious Cygnus Bubble, a gamma-ray structure thousands of light-years across. Their model reproduces both the bubble's brightness and shape if Cygnus X-3 channels just 1-3% of its power into particle acceleration. Published in The Astrophysical Journal Letters.

TESS halla una rara enana marrón que podría zanjar cómo se forman estos objetos a medio camino entre estrella y planeta

El satélite TESS de la NASA ha permitido al equipo de Nino Ephremidze (Universidad de Harvard) medir con precisión inusual la enana marrón HIP 61637 b, en órbita casi circular alrededor de una estrella de tipo A envejecida de casi tres masas solares — la estrella más brillante y masiva jamás hallada con una enana marrón en tránsito. Su órbita circular sugiere una formación de tipo planetario, aunque con 48 masas de Júpiter tensa los límites de ese mecanismo. Es apenas la séptima enana marrón con una edad fiablemente conocida.

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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