Tránsito De La Estación Espacial Tiangong

NGC 6888, también conocida como la Nebulosa Creciente, es una burbuja cósmica de unos 25 años luz de diámetro, arrastrada por los vientos de su estrella central, brillante y masiva. La estrella central de NGC 6888 está clasificada como una estrella Wolf-Rayet (WR 136). La estrella se desprende de su envoltura exterior con un fuerte viento estelar., expulsando el equivalente a la masa del Sol cada 10.000 años.

Créditos: Michael Miller , Jimmy Walker

Esta es la primera imagen del Rover Perseverance de la NASA en la superficie de Marte desde la cámara del Experimento de Imágenes de Alta Resolución (HiRISE) a bordo del Mars Reconnaissance Orbiter (MRO) de la NASA muestra las muchas partes del sistema de aterrizaje de la misión Marte 2020 que puso al rover a salvo en tierra. La imagen fue tomada el 19 de febrero de 2021.

Con los tiempos de frío en el hemisferio norte sabemos que es hora de estar admirando a la nebulosa de Orión (M42), pero si tenemos el equipo adecuado seremos capaces de captar otros cuerpos cerca de esa región como lo son el hombre corredor (Sh2-279), Cabeza de caballo (Bernard 33 en IC 434) y la Flama (NGC 2024)

Crédito: Daniel Velázquez

https://instagram.com/dnvlgm

~Antares

Stars Make Firework Supplies!

The next time you see fireworks, take a moment to celebrate the cosmic pyrotechnics that made them possible. From the oxygen and potassium that help fireworks burn to the aluminum that makes sparklers sparkle, most of the elements in the universe wouldn’t be here without stars.

From the time the universe was only a few minutes old until it was about 400 million years old, the cosmos was made of just hydrogen, helium and a teensy bit of lithium. It took some stellar activity to produce the rest of the elements!

Stars are element factories

Even after more than 13 billion years, the hydrogen and helium that formed soon after the big bang still make up over 90 percent of the atoms in the cosmos. Most of the other elements come from stars.

Stars began popping into the universe about 400 million years after the big bang. That sounds like a long time, but it’s only about 3% of the universe’s current age!

Our Nancy Grace Roman Space Telescope will study the universe’s early days to help us learn more about how we went from a hot, soupy sea of atoms to the bigger cosmic structures we see today. We know hydrogen and helium atoms gravitated together to form stars, where atoms could fuse together to make new elements, but we're not sure when it began happening. Roman will help us find out.

The central parts of atoms, called nuclei, are super antisocial – it takes a lot of heat and pressure to force them close together. Strong gravity in the fiery cores of the first stars provided just the right conditions for hydrogen and helium atoms to combine to form more elements and generate energy. The same process continues today in stars like our Sun and provides some special firework supplies.

Carbon makes fireworks explode, helps launch them into the sky, and is even an ingredient in the “black snakes” that seem to grow out of tiny pellets. Fireworks glow pink with help from the element lithium. Both of these elements are created by average, Sun-like stars as they cycle from normal stars to red giants to white dwarfs.

Eventually stars release their elements into the cosmos, where they can be recycled into later generations of stars and planets. Sometimes they encounter cosmic rays, which are nuclei that have been boosted to high speed by the most energetic events in the universe. When cosmic rays collide with atoms, the impact can break them apart, forming simpler elements. That’s how we get boron, which can make fireworks green, and beryllium, which can make them silver or white!

Since massive stars have even stronger gravity in their cores, they can fuse more elements – all the way up to iron. (The process stops there because instead of producing energy, fusing iron is so hard to do that it uses up energy.)

That means the sodium that makes fireworks yellow, the aluminum that produces silver sparks (like in sparklers), and even the oxygen that helps fireworks ignite were all first made in stars, too! A lot of these more complex elements that we take for granted are actually pretty rare throughout the cosmos, adding up to less than 10 percent of the atoms in the universe combined!

Fusion in stars only got us through iron on the periodic table, so where do the rest of our elements come from? It’s what happens next in massive stars that produces some of the even more exotic elements.

Dying stars make elements too!

Once a star many times the Sun’s mass burns through its fuel, gravity is no longer held in check, and its core collapses under its own weight. There, atoms are crushed extremely close together – and they don’t like that! Eventually it reaches a breaking point and the star explodes as a brilliant supernova. Talk about fireworks! These exploding stars make elements like copper, which makes fireworks blue, and zinc, which creates a smoky effect.

Something similar can happen when a white dwarf star – the small, dense core left behind after a Sun-like star runs out of fuel – steals material from a neighboring star. These white dwarfs can explode as supernovae too, spewing elements like the calcium that makes fireworks orange into the cosmos.

When stars collide

White dwarfs aren’t the only “dead” stars that can shower their surroundings with new elements. Stars that are too massive to leave behind white dwarfs but not massive enough to create black holes end up as neutron stars.

If two of these extremely dense stellar skeletons collide, they can produce all kinds of elements, including the barium that makes fireworks bright green and the antimony that creates a glitter effect. Reading this on a phone or computer? You can thank crashing dead stars for some of the metals that make up your device, too!

As for most of the remaining elements we know of, we've only seen them in labs on Earth so far.

Sounds like we’ve got it all figured out, right? But there are still lots of open questions. Our Roman Space Telescope will help us learn more about how elements were created and distributed throughout galaxies. That’s important because the right materials had to come together to form the air we breathe, our bodies, the planet we live on, and yes – even fireworks!

So when you’re watching fireworks, think about their cosmic origins!

Learn more about the Roman Space Telescope at: https://roman.gsfc.nasa.gov/

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Las estrellas más brillantes incrustadas en nebulosas a lo largo de nuestra galaxia derraman un torrente de radiación que devora vastas nubes de gas hidrógeno, la materia prima para construir nuevas estrellas. Este proceso de grabado esculpe un paisaje de fantasía donde la imaginación humana puede ver todo tipo de formas y figuras. Esta nebulosa en la constelación de Cassiopeia tiene velos fluidos de gas y polvo que le han valido el sobrenombre de "Nebulosa Fantasma".

Oficialmente conocida como IC 63, esta nebulosa se encuentra a 550 años luz de distancia en la constelación de Cassiopeia the Queen.

Crédito: NASA, ESA y STScI / Universidad de Estrasburgo

Luna

Cámara digital compacta Canon Powershot Sx60hs X85 zoom, sin telescopio.

Crédito: Hidehiko Akazawa

This is Caldwell 109! 🎆🎆🎆

This “phantom snowball” planetary nebula shows ornate, beautiful shapes like spirals of gas that we’ll likely see when the Sun dies as well. It was also the last picture I needed to finish my Caldwell collection - such a great way to end a remarkable astrophotography experience! 🍭🍭🍭

Taken by me (Michelle Park) using the Slooh Canary Two telescope on November 10th, 2020 at 02:22 UTC.

Región activa solar AR2786 (Izquierda) y AR2785 (Derecha) en comparativa con nuestro planeta.

Crédito: Paul's Astrophotography

NEOWISE

El polvo de cometa cae a través de un cielo crepuscular en esta escena onírica, pero no es parte de una película de cuento de hadas.

Capturado el 20 de julio, la racha brillante sobre las torres del castillo es probablemente un meteoro de las Perseidas.

Crédito: Stephane Guisard

A veces solo es necesario alejarse de la ciudad, tomar aire fresco y apreciar las estrellas.

Crédito: Tero Marin

https://instagram.com/teromarin

~Antares