Sierra-Juliet

TS en Química Ambiental. Me gusta la aviación, la astronomía, la meteorología y sacar alguna que otra foto de vez en cuando.

[Sierra-Juliet @StealthSJ]

Acercar la Astronomía a las personas https://t.co/aOJPXbpxA6

[Red Investigación Bólidos y Meteoritos (SPMN) @RedSpmn]

DELTA PÍSCIDA #SPMN160626G SOBRE #LLEIDA ESTA MADRUGADA a las 3h23m36s TUC (5h23 CEST). Un enjambre meteórico descubierto hace algo más de una década, asociado al C/1864 N1 (Tempel). 📹Carles Pineda @karpin_73 desde Gavà. Seleccionado para el listado🤩🌠
🔖https://t.co/ZL49qmwMg0

[Red Investigación Bólidos y Meteoritos (SPMN) @RedSpmn]

ESPECTACULAR BÓLIDO ESPORÁDICO #SPMN140626G SOBRE OCCITANIA, #FRANCIA ANOCHE a las 20h52m58 TUC (22h52 CEST). Así lo captó Antonio Lasala @AntonioLG1 desde Morata de Jalón, #Zaragoza. Evento también captado por 5 estaciones #FRIPON @VigieCiel, al listado:
https://t.co/ZL49qmwMg0

[Fernando Cabrerizo @FerCabPal]

Un breve timelapse de la Vía Láctea desde el hosting de telescopios Trevinca Skies en A Veiga, #Ourense.
Ese tono verdoso del cielo es conocido como airglow, un brillo natural del cielo que se ve de vez en cuando, pero mucho mejor en zonas oscuras.

[Sierra-Juliet @StealthSJ]

T-2 meses

[Red Investigación Bólidos y Meteoritos (SPMN) @RedSpmn]

BÓLIDO ESPORÁDICO #SPMN100626F SOBRE #BADAJOZ ANOCHE a las 21h26m04 TUC (23h26 CEST). Reportado visualmente por Javier Castellanos @AstronomiaRivas desde Rivas-Vaciamadrid. Un evento precioso con fragmentación final. Al listado de bólidos del @ice_csic👇
➡️https://t.co/ZL49qmwMg0

[European Space Agency @esa]

Our astronaut Luca Parmitano is assigned as pilot of NASA’s #ArtemisIII mission.

With Europe powering Orion with the European Service Module, this mission will test the critical operations preparing for humankind's return to the Moon.

A strong step forward for ESA–NASA partnership.

🔗https://t.co/MJpn0ftcpr

📸 NASA

[Sierra-Juliet @StealthSJ]

Ver a nuestros F-18 operando en autovías es una imagen bastante curiosa. Aquí en España no sé si tendremos alguna recta lo suficientemente despejada o bien pavimentada para hacer lo mismo.

[Ejército del Aire y del Espacio @EjercitoAire]

Participan siete cazas del Ala 12 en el Ramstein Flag 26, ejercicio aéreo de la OTAN, desde la Base Aérea de Jyväskylä.

Los F-18 realizan tomas, despegues y aterrizajes en las autovías habilitadas para ello como parte de las ops de dispersión de la Fuerza Aérea Finlandesa.

[Red Investigación Bólidos y Meteoritos (SPMN) @RedSpmn]

BÓLIDO ESPORÁDICO #SPMN080G26B SOBRE #ALBACETE Y #VALÈNCIA HOY a las 0h57m17s TUC (2h57 CEST). Desplegando una preciosa estela sobre #Boyero lo captó Jordi Donet @DonetJorge desde Barx-La Drova, La Safor. Pronto en el listado actualizado del @ice_csic:😍
🌠https://t.co/ZL49qmwMg0

[Erika  @ExploreCosmos_]

Astronomers have directly observed the rotation of a protoplanetary disk in real time for the first time, focusing on the young star AB Aurigae, a nearby system where planets are still forming inside a broad disk of gas and dust.

Protoplanetary disks are the raw material from which planetary systems emerge, but until now their motion had mostly been inferred through indirect methods or through gas observations.

In this case, researchers used the SPHERE instrument on the European Southern Observatory’s Very Large Telescope to track the movement of dust structures in the disk over several years, allowing them to see how the disk itself evolves and rotates.

The disk around AB Aurigae mostly follows the expected Keplerian motion: material closer to the star moves faster, while material farther away moves more slowly, as gravity predicts. However, the observations also revealed important deviations from this simple pattern, especially in the inner regions of the disk.

Some structures appear to move in ways that do not fully match standard theoretical models, suggesting that the disk is being disturbed by complex internal processes. One strong possibility is that forming giant planets are interacting gravitationally with the surrounding material, shaping spirals, shadows, clumps, and accretion zones as they grow.

This is especially interesting because AB Aurigae has already been considered one of the best laboratories for studying planet formation. Previous observations had identified spiral structures and possible protoplanet candidates, including AB Aurigae b, a massive object still embedded in the disk.

The new observations add a dynamic dimension to that picture: instead of seeing the disk as a static image, astronomers can now follow how its structures move over time. That makes it possible to test whether suspected planets are really responsible for the observed distortions.

The study also found rapidly moving shadows cast across the surface of the disk. These shadows may be produced by opaque dust clumps or by forming planetary bodies orbiting close to the star.

Their motion suggests that the inner disk is not a simple, flat, orderly structure, but a disturbed and evolving environment where several bodies or dense accumulations of material may be interacting at once.

In some regions, the disk appears to rotate more slowly than expected, which may indicate that the forming planets are not moving in the same plane as the main disk or may be following inclined or elliptical orbits.

The importance of this observation is that it gives us a more direct way to study planet formation as an active process. Instead of only identifying gaps, rings, or spirals and then inferring the presence of planets, we can now watch how those structures change with time.

This makes it easier to connect disk dynamics with the hidden objects that may be shaping them. The result shows that planetary nurseries are more complex than idealized models suggest, and that planets may form in environments that are tilted, unstable, shadowed, and dynamically disturbed.

👉 https://t.co/fjvrAlcnWA

[AMSAT-DL @amsatdl]

Tianwen-2 at AOS @SternwarteBO, after arriving at Asteroid AST469219. We are also live streaming on our Youtube channel.

[Project Fear @ProjectFearX]

A craft the public has never seen before…
Video out this Friday.

#ProjectFear #Area51

[Yogulado @Supertramp9713]

El piloto:

[Gaston Giribet @GastonGiribet]

La brecha de masas de los agujeros negros, confirmada: "Se esperaba que el espectro de masas de las fusiones de agujeros negros binarios mostrara una 'brecha de masas' por encima de las 45 masas solares, en consonancia con la física de las supernovas de inestabilidad de pares.

[Parc Astronòmic Prades @parcastroprades]

Aquesta espectacular imatge mostra el pas del cometa C/2025 R3 (PanSTARRS) davant d’una de les constel·lacions més emblemàtiques del cel: Orió.

📷 Jakub Kuřák i Martin Mašek, amb imatges captades entre l’1 i el 22 de maig de 2026 des de prop de Cerro Paranal, Xile

[Víctor M. González @gdvictorm]

La primavera meteorológica se despide a lo bestia, con 4 estaciones superando 40ºC.

Este lunes empieza el verano climatológico y por suerte dará un respiro; tras 2 semanas propias de finales de julio tendremos una normalización térmica. Mapa de anomalías previstas el miércoles⬇️

[Asher B. @asherbphotos]

There's a lot to unpack with LC-36 since New Glenn's explosion last night, so here's a thread on everything I saw from the air this morning:

📸 - @LaunchHeavenX

[Sierra-Juliet @StealthSJ]

Ahí hubo un cohete de metano y oxígeno líquidos de casi 100m de altura y 7m de diámetro...

[Asher B. @asherbphotos]

First look at LC-36 from the air this morning after the explosion of New Glenn last night during a failed hotfire test.
Visible is the wreckage from the destroyed TE as well as the fallen lightning tower. More to come soon.

📸 - @LaunchHeavenX

[Jeff Bezos @JeffBezos]

All personnel are accounted for and safe. It’s too early to know the root cause but we’re already working to find it. Very rough day, but we’ll rebuild whatever needs rebuilding and get back to flying. It’s worth it.

[Spaceflight Now @SpaceflightNow]

Here's our video of the explosion at Launch Complex 36. It happened about 9 pm ET (0100 UTC) as Blue Origin was beginning a static fire test of its New Glenn rocket.

Watch live views: https://t.co/tm2wZQmAVD

[Víctor M. González @gdvictorm]

Impresionantes los datos de Castilla y León hoy.

Todas las capitales superando los 30ºC, por encima incluso de la media del periodo canicular (finales de julio y principios de agosto) en MAYO.

Parece que la próxima semana desaparecerá progresivamente este calor.