A snapshot of star formation in a typical corner of the universe
En los pliegues de la Nebulosa de Carina, el telescopio James Webb ha descubierto lo que décadas de observación no pudieron revelar: el nacimiento silencioso de estrellas ocultas tras nubes de polvo cósmico. Con visión infrarroja sin precedentes, Webb penetró esa oscuridad y encontró veinticuatro chorros de hidrógeno molecular emanando de protoestrelas jóvenes, muchas destinadas a convertirse en soles como el nuestro. Este hallazgo no es solo un logro técnico, sino una invitación a repensar cuán abundante y ordinaria es la creación estelar en el universo.
- Durante décadas, las densas nubes de gas y polvo en NGC 3324 mantuvieron ocultos los primeros instantes del nacimiento estelar, incluso para el poderoso telescopio Hubble.
- Webb detectó 24 chorros de hidrógeno molecular previamente desconocidos, señales inequívocas de protoestrelas en su fase más activa y violenta de formación.
- La astrónoma Megan Reiter, de la Universidad Rice, lidera el estudio publicado en Monthly Notices of the Royal Astronomical Society, describiendo el hallazgo como una ventana a una región del universo más típica de lo que se había podido examinar antes.
- Los chorros limpian el entorno de las estrellas nacientes y revelan el breve pero crucial período en que el material se acumula y es expulsado violentamente, antes de que la estrella alcance estabilidad.
- El descubrimiento abre una nueva frontera: comprender cómo la radiación de estrellas masivas cercanas podría moldear el desarrollo de planetas alrededor de estrellas más jóvenes y pequeñas, como ocurrió en nuestro propio sistema solar.
Cuando los científicos de la NASA examinaron con detenimiento una de las primeras imágenes icónicas del telescopio James Webb —una región conocida como los Acantilados Cósmicos, en la Nebulosa de Carina— encontraron algo que Hubble nunca había podido ver. Enterrados en el interior de NGC 3324, había chorros y flujos energéticos de estrellas jóvenes que las nubes de polvo habían mantenido invisibles durante décadas.
Hubble ya había observado este paisaje de montañas y valles cósmicos, pero la luz visible no puede atravesar las densas nubes que rodean a las estrellas recién nacidas. Webb, equipado con visión infrarroja de resolución sin precedentes, sí pudo hacerlo. Analizando datos a una longitud de onda de 4,7 micrómetros, el equipo investigador descubrió dos docenas de chorros desconocidos provenientes de protoestrelas muy jóvenes, identificados por la firma del hidrógeno molecular.
El hidrógeno molecular es la materia prima de la formación estelar. A medida que las estrellas jóvenes crecen, atraen hidrógeno hacia sí y luego lo expulsan violentamente en chorros y flujos polares que limpian el espacio circundante. Este período es breve pero intenso, y muchas de las estrellas reveladas por Webb están en camino de convertirse en estrellas de baja masa, similares a nuestro Sol.
Megan Reiter, astrónoma de la Universidad Rice que lideró el estudio, destacó que Webb ofrece por primera vez una imagen real de cuánta formación estelar ocurre en rincones del universo mucho más comunes de lo que los instrumentos anteriores permitían examinar. Su coautor Nathan Smith, de la Universidad de Arizona, subrayó que estos chorros marcan el momento más fascinante del nacimiento estelar: cuando el material se acumula activamente y es expulsado con violencia.
Las implicaciones son amplias. El hallazgo inaugura una nueva era en la comprensión de cómo se forman estrellas como el Sol y cómo la radiación de estrellas masivas cercanas podría influir en el desarrollo de planetas alrededor de estrellas más pequeñas. El universo, al parecer, ha estado lleno de actividad creadora todo el tiempo. Solo necesitábamos mejores ojos para verlo.
When NASA scientists took a closer look at one of the James Webb Space Telescope's first iconic images—a region called the Cosmic Cliffs—they found something the Hubble telescope had missed entirely. Buried within the stellar nursery of NGC 3324, nestled in the Carina Nebula, were the energetic jets and outflows of young stars that dust clouds had kept hidden from view for decades. The discovery marks a turning point in how astronomers can observe the earliest, most ordinary moments of star birth across the universe.
The Cosmic Cliffs had been studied before. Hubble had looked at this landscape of cosmic mountains and valleys studded with bright stars, but the visible light wavelengths that telescope relies on could only see so far. The dense clouds of gas and dust that surround newborn stars remain opaque to ordinary light. Webb, equipped with infrared vision of unprecedented resolution, could see straight through. By analyzing data at a wavelength of 4.7 micrometers—a specific slice of infrared light—the research team uncovered two dozen previously unknown jets streaming from extremely young protostars, revealed by the signature of molecular hydrogen.
Molecular hydrogen is the raw material of star formation. As young stars grow, they pull hydrogen toward themselves and then violently expel it in jets and polar flows. These jets, visible now in Webb's observations, sweep clean the space around the forming star. The presence of these hydrogen outflows is a window into the most active, most dramatic phase of a star's infancy—a period that lasts only briefly before the protostars settle into a more stable existence. Many of the stars Webb revealed in the Cosmic Cliffs are on their way to becoming low-mass stars like our Sun.
Megan Reiter, an astronomer at Rice University in Houston who led the study, described what Webb has made possible: a snapshot of how much star formation is actually happening in what might be a far more typical corner of the universe than astronomers have ever been able to examine before. The finding, published in the Monthly Notices of the Royal Astronomical Society, suggests that star birth in ordinary environments may be far more common and far more visible than previous instruments could detect. Nathan Smith, a coauthor from the University of Arizona, emphasized that jets like these mark the most exciting moment in star formation—the brief window when material is actively accumulating onto the protostars and being violently ejected.
The implications ripple outward. This discovery opens a new chapter in understanding how stars like the Sun actually form, and how the intense radiation from massive nearby stars might shape the development of planets around younger, smaller stars. Reiter noted that the findings point toward a new research frontier: astronomers now know where to look next and what questions to ask about which factors matter most when Sun-like stars are born. The universe, it turns out, has been full of star-making activity all along—we simply needed better eyes to see it.
Citas Notables
Webb gives us a snapshot in time to see how much star formation is occurring in what may be a more typical corner of the universe that we haven't been able to see before.— Megan Reiter, Rice University
Jets like these are indicators of the most exciting part of star formation—we only see them during the brief period when material is actively accumulating onto the protostars.— Nathan Smith, University of Arizona
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that Webb found these jets when Hubble couldn't? Aren't they just more of the same thing?
The difference is that Hubble was essentially blind to what was happening inside the dust. These jets are happening right now, in real time, in regions that look ordinary—not exotic or unusual. Before Webb, we could only study star formation in the clearest, most accessible places. Now we can see it everywhere.
So you're saying star formation is more common than we thought?
Not necessarily more common, but more visible. There's probably been this whole population of young stars forming in typical environments that we simply couldn't observe. It's like discovering that the forest is much fuller than you realized because you finally have a light that works in the dark.
What's the significance of the molecular hydrogen jets specifically?
They're a clock and a thermometer combined. They only appear during the most active phase of star birth, when material is pouring onto the protostars. If you see them, you know you're watching the crucial moment—the brief window when a star is actually being built.
And many of these will become stars like ours?
Yes. That's what makes this so grounded. We're not looking at exotic objects or extreme environments. We're watching the ordinary process that created our own Sun, happening right now in the Carina Nebula, finally visible to us.