Sistema Solar

¿Trajeron los cometas los ingredientes de la vida? Un nuevo modelo dice que casi nunca

Durante décadas se ha propuesto que los cometas sembraron la Tierra primitiva con los ladrillos químicos de la vida. Un nuevo estudio en Scientific Reports pone en duda esa idea: tras modelar 100.000 historias de impactos cometarios, concluye que entregar el ingrediente clave —el cianuro de hidrógeno— en cantidades útiles fue “extremadamente raro”, hasta diez mil veces demasiado diluido. Es un modelo, ajustado incluso para favorecer el reparto, y trata de moléculas orgánicas, no del agua. Te contamos qué dice y qué no. Para acceder al contenido completo, hazte miembro haciendo clic en el enlace que aparece a continuación.

Nuevos

The worlds that outlived their star: a dead white dwarf ringed by a double disc of debris

When a Sun-like star dies as a white dwarf, it often shreds its leftover planets into a disc of rocky debris. Astronomers using ESO’s Very Large Telescope have now found a white dwarf, WD J1328−1450, wrapped in not one but two distinct rings, apparently shepherded by two surviving bodies — one asteroid-sized, the other as large as Pluto. The first stable double debris disc of its kind, it is a rare preview of how our own Solar System may one day end. We separate what was seen from what is inferred. To access the full content, become a member by clicking the link below.

Two outflows from one dying star: a magnetar model ties a gamma-ray burst to its supernova

In 2006, NASA’s Swift satellite caught an unusual nearby gamma-ray burst, GRB 060218, bundled with the supernova SN 2006aj — and it left two puzzles: a glow of thermal X-rays and an optical light curve that brightened twice. A new Astronomy & Astrophysics study argues a single culprit explains both: a newborn magnetar that splits its enormous energy into a narrow jet and a broad wind, each lighting up a different part of the dying star. An elegant unified model, though not the final word. To access the full content, become a member by clicking the link below.

Cosmología

Exploración Espacial

ALERTA: La Vikingo 2 pudo haber registrado temblores de Marte en 1976

En 1976, el módulo Viking 2 posó en Marte un sismómetro que durante casi medio siglo se consideró un fracaso: iba atornillado a la cubierta de la nave, y el viento marciano la sacudía tanto que ahogaba cualquier temblor del suelo. Ahora, un reanálisis del equipo de Constantinos Charalambous y Benjamin Fernando, apoyado en lo aprendido con la misión InSight, rescata de aquel ruido una decena de eventos candidatos que no parecen ni viento ni vibración del módulo: posibles terremotos marcianos que quedaron registrados sin que nadie lo notara. Para acceder al contenido completo, hazte miembro haciendo clic en el enlace que aparece a continuación.
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Radioastronomía

Vida extraterrestre

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    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

    How fast galaxies spin could become a new, independent ruler for the cosmos

    One of astronomy’s most reliable rules says the more massive a galaxy, the faster it spins — the baryonic Tully-Fisher relation. A new Astronomy & Astrophysics study argues this humble law could double as an independent ruler for the cosmos, encoding the universe’s matter density, its clumpiness, and even the nature of dark matter. Using 1,024 simulated universes and machine learning, Francesco Sinigaglia recovers those quantities to within a few percent — though, for now, entirely inside simulations. To access the full content, become a member by clicking the link below.

    Weighing the invisible: Hubble readies the Roman telescope to hunt gravitational lenses

    In a new Hubble image, a galaxy 8 billion light-years away has been stretched into a glowing arc by the gravity of a closer one — a gravitational lens that works as a natural scale for weighing dark matter. NASA is capturing such lenses with Hubble not only for what they reveal now, but to prepare its successor: the Nancy Grace Roman Space Telescope, whose vast field of view will sweep up lenses in bulk, decoded with tools Hubble is training today. To access the full content, become a member by clicking the link below.

    To read the real sky, physicists built the largest simulated universe ever on Aurora

    To understand the real universe that telescopes are now mapping in extraordinary detail, cosmologists first need a near-perfect artificial one. A team led by Harvard’s Daniel Eisenstein has built exactly that on Argonne’s Aurora exascale supercomputer: a simulation of 35 trillion particles, which they call the largest cosmological N-body simulation ever run. It is less a discovery than a measuring stick — a reference cosmos precise enough to turn billions of mapped galaxies into real answers about dark matter and dark energy. To read the full article, become a member by clicking the link below.

    El Gordo, too massive and too early: a hint that dark matter collides with itself

    Seven billion light-years away, a collision of two giant galaxy clusters nicknamed “the Fat One” is so massive it strains the standard idea that dark matter is perfectly collisionless. A new study argues El Gordo fits better if dark matter can occasionally collide with itself and cool — a two-state self-interacting model that lets structure grow faster. A tantalizing clue to the nature of dark matter, though far from proof. To read the full article, become a member by clicking the link below.

    El telescopio Webb caza una supernova del universo joven, atrapada poco después de estallar

    Cuando el universo tenía unos 2.000 millones de años, una estrella masiva estalló, y su luz tardó 11.700 millones de años en llegar al telescopio James Webb, que la atrapó poco después del estallido: aún caliente y azul. SN 2023aeaf es una de las supernovas más lejanas confirmadas por espectro, y en ella hasta se ve el tiempo estirado por la expansión del universo. Para acceder al artículo completo, hazte miembro haciendo clic en el enlace que aparece a continuación.

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