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

A case of mistaken identity: stars that steal mass can masquerade as magnetic red giants

Astronomers have learned to measure the magnetic fields hidden deep inside red-giant stars by reading their oscillations. But a new Astronomy & Astrophysics study warns of a trap: a star that stole mass from a companion, or merged with another, can mimic the very same signatures, faking a strong magnetic field it may not have. Tested on two likely merger stars, models with mass gain fit the data where ordinary single-star models failed — a reminder that to read a star’s magnetism, you first need to know its life story. To access the full content, become a member by clicking the link below.

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.

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

    A faint twist in the ancient light: first evidence that giant galaxy clusters are spinning

    Do galaxy clusters — the largest gravitationally bound objects in the universe — actually spin? Two astronomers at Columbia University report the first clear evidence that they do, read from the faint imprint clusters leave on the Big Bang’s relic light. Stacking 25 nearby clusters in maps from the Planck satellite, they found a tiny temperature dipole aligned with each cluster’s estimated rotation axis. It is a 3.6-sigma hint, not a physical spin speed — but it opens a new window on the hidden motions of cosmic gas. To access the full content, become a member by clicking the link below.

    El monstruo que miraba hacia otro lado: un estallido de rayos gamma se delató por su resplandor

    El 10 de marzo de 2026, el telescopio Fermi captó un estallido de rayos gamma, GRB 260310A, con un fogonazo inicial modesto. Pero su resplandor posterior fue excepcional: subió despacio durante horas hasta eclipsar a su galaxia y volvió a encenderse en rayos X semanas más tarde. La explicación apunta a un monstruo escondido: un chorro colosal de una estrella moribunda que apuntaba lejos de la Tierra y se delató por su luz tardía. Te contamos qué se observó y qué se interpreta. Para acceder al contenido completo, hazte miembro haciendo clic en el enlace que aparece a continuación.

    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.

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