David, Rey de Israel / Israel's King: La cita / The quote Tweet

"Cuando veo tus cielos, las obras de tus dedos,
la luna y las estrellas que tú has preparado,
¿qué es el hombre mortal para que lo tengas presente,
y el hijo del hombre terrestre para que cuides de él?"
Salmos 8:3, 4

David, Rey de Israel -1107 a. E. C. - 1037 a. E. C.

"When I see your heavens, the works of your fingers,
The moon and the stars that you have prepared,
What is mortal man that you keep him in mind,
And the son of earthling man that you take care of him?"
-Psalms 8:3, 4

David, Israel's King -1107 b. C. E - 1037 b. C. E.

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Estrellas en Nuestra Propia Galaxia, y más Allá Tweet

Estrellas en Nuestra Propia Galaxia, y más Allá

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Ahora es el momento para ver cómo las estrellas pueden existir dentro de cada galaxia. Es sólo recientemente que los astrónomos han tenido telescopios suficientemente grandes  para estudiar estrellas individuales o pequeños grupos de estrellas en las galaxias más allá de la nuestra. Así, la mayoría de nuestro conocimiento de la clase de pequeñas colecciones de estrellas proviene del estudio de aquellas en nuestra propia galaxia.

Hay un problema inmediato. Podemos decir que todas las estrellas en una galaxia distante estan la misma distancia y pertenecen a la galaxia, porque podemos ver que las estrellas están separadas de otras galaxias cercanas por las enormes distancias del espacio intergaláctico. Pero la visión que tenemos de las estrellas de nuestra propia galaxia, como las vemos desde el interior de la galaxia, es mucho más confusa. Siempre ha sido difícil para los astrónomos desentrañar la casualidad por la cual la línea de visión de las estrellas coincide con los grupos reales.

Con muy pocas excepciones, todas las estrellas que podemos ver a simple vista pertenecen a nuestra propia galaxia, la Vía Láctea. A pesar de que los poetas hablan de las "innumerables" estrellas visibles, de hecho menos de 4.000 estrellas se pueden ver en un momento dado a simple vista. El astrónomo griego Hiparco (129 a. E. C.) las clasifico en seis magnitudes, con estrellas de la primera magnitud como las más brillantes, y las estrellas de magnitud seis las más débiles que él podía ver. Esta escala, con modificaciones, se encuentra todavía en uso hoy en día.

Amor Elefante: Hoy es hermoso Tweet

Amor Elefante: "Hoy es hermoso"

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Stars in Our Own Galaxy, and Beyond Tweet

Stars in Our Own Galaxy, and Beyond

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It is time now to see how stars exist within each galaxy. It is only recently that astronomers have had large enough telescopes to study individual stars or small groups of stars in galaxies beyond our own. Thus most of our knowledge of the kind of smaller collections of stars comes from studying the ones in our own Galaxy.

There is an immediate problem. We can say that all the stars in a distant galaxy are the same distance and belong to that galaxy because we can see that the stars are separated from other nearby galaxies by the enormous distances of the intergalactic space. But the view we have of the stars of our own Galaxy as seen from inside the Galaxy is far more confused. It has always been difficult for astronomers to disentangle chance, line-of-sight coincidences of stars from real groups.

With very few exeptions, all the stars we can see with the unaided eye belong to our own galaxy, The Milky Way. Although poets talks of the "countless" visible stars, in fact less than 4000 stars can be seen at a time with the unaided eye. The Greek astronomer Hipparchus (129 a. E. C.) classified them into six magnitudes, with stars of the first magnitude being the brightest, and stars of the six magnitude the faintest which he could see. This scale, with modifications, is still in use today.

Una Mirada a las Incontables Estrellas / A Look at the Countless Stars Tweet

Una Mirada a las Incontables Estrellas / A Look at the Countless Stars

Con muy pocas excepciones, todas las estrellas que podemos ver a simple vista pertenecen a nuestra propia galaxia, la Vía Láctea. A pesar de que los poetas hablan de las "innumerables" estrellas visibles, de hecho menos de 4.000 estrellas se pueden ver en un momento dado a simple vista. Veamos algunas de ellas, y de paso, unos globulos estelares, dentro y fuera de la Vía Láctea.

With very few exeptions, all the stars we can see with the unaided eye belong to our own galaxy, The Milky Way. Although poets talks of the "countless" visible stars, in fact less than 4000 stars can be seen at a time with the unaided eye. Lets see some of them and some globular clusters from our Milky Way and beyond.

A mere 4.3 light-years distant, Alpha Centauri actually consists of two component stars similar in size to the Sun, locked in a mutual orbit, and a third star (Proxima Centauri) going around this two

Alpha Centauri 1

Comparison: Sun, Alpha Centauri A, Alpha Centauri B and proxima Centauri

Antares, en Escorpion 1

Antares, en Escorpion 2

Antares, en Escorpion 3

Betelgeuse 1

Betelgeuse 2

Betelgeuse 3

Orion's Belt

In the Great Nebula of Orion (M42) lies the star known as Theta1 Orionis, but actually is not an star, it is a bright star cluster known as the Trapezium

Cassiopeia A - The colourfull aftermath of a violent stellar death

Dying star, called IC 4406

In the constellation of Aquila (the Eagle), lies a star nearing the end of its life that is surrounded by a starfish-shaped cloud of gas and dust

Mizar y Alcor

 Altair

 Deneb

Vega

Triangulo de Verano: Altair, Vega y Deneb

Comparison: Sirius A and B, the Sun and the Summer Triangle

The Cat's Eye Nebula A Dying Star Creates a Sculpture of Gas and Dust

The Pleiades, or Seven Sisters

This image shows a dark interstellar cloud ravaged by the passage of Merope, one of the brightest stars in the Pleiades star cluster.

The binary star system Eta Carinae

The central star of NGC2440 is one of the hottest known, with a surface temperature near 200,000 degrees Celsius

This image of NGC 2440 shows the colourfull last hurrah of a star like our Sun

The two billowing structures in this IRAS 13208-6020 are formed from material that is shed by a central star

Star Cluster M92

Star Cluster Omega Centauri

The core of the star cluster in NGC 3603 is shown in great detail in an image from the Wide Field Planetary Camera 2 (WFPC2) camera on the NASAESA Hubble Space Telescope

The swirling, dusty nebula of a massive star-forming region within the Small Magellanic Cloud galaxy

Hot dying star. Two binary stars has gone nova in the Centauri Globular Star Cluster, NGC5139

Star Cluster NGC 1850 is a young globular star cluster located some 168,000 light years away in the Large Magellanic Cloud

Nicknamed the Southern Pinwheel, M83 is undergoing more rapid star formation than our own Milky Way galaxy, especially in its nucleus.  Hundreds of clusters and tremendous activity

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Nebulas: Gas y Polvo Condensado Tweet

Nebulas: Gas y Polvo Condensado

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Pensamos en las galaxias como colecciones de estrellas, pero las galaxias irregulares y las galaxias espirales, como la nuestra, contienen gas. Parte del gas se encuentra en forma de hidrógeno a partir de restos de la formación original de cada galaxia, recién salido del Big Bang. Algo del gas se ha reciclado a partir de estrellas moribundas hacia el espacio, bien por la persistencia de un viento estelar, por el puf esporádico de una enana blanca que muere en silencio o por la explosion cataclísmica de una estrella masiva, que se convierte en supernova. El gas reciclado contiene, pues, contaminación cósmica, generada por las reacciones nucleares dentro de las estrellas.

El gas interestelar se haya en su mayoría en forma de átomos individuales, alrededor de un átomo por centímetro cúbico en las proximidades del Sol. Un tipo, el átomo de hidrógeno, puede ser detectado por su emisión a una longitud de onda de 21 cm. Otros, por ejemplo, el calcio y el sodio, absorben longitudes de onda específicas de la luz de estrellas distantes, a medida que su luz atraviesa el espacio interestelar.

The Witch Head Nebula & Supernova 1994D. La foto 1800 x 1333 & 1280 x 1280 pix. Tweet

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Nebulae: Gas & Dust Condensed Tweet

Nebulae: Gas & Dust Condensed

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We think of galaxies as collections of stars, but irregular galaxies and spiral galaxies, like our own, contain gas as well. Some of the gas is in form of hydrogen leftover from the original formation of each galaxy, fresh from the Big Bang. Some has been recycled from dying stars back into space, by the persistent blowing of a stellar wind, by the sporadic puf of a quietly dying white dwarf or by the cataclysmic explosion of a massive star as it goes supernova. The recycled gas thus contains cosmic pollution, generated by the nuclear reactions inside the stars.

The interstellar gas is mostly in the form of individual atoms, approximately one atom per cubic centimeter in the sun's neighborhood. One kind, the hydrogen atom, can be detected by its ratio emission at a wavelength of 21 cm. Others, for instance calcium and sodium, absorb particular wavelengths from the light of distant stars, as the light traverses interstellar space.

Nebulosas: La Mezcla Estelar de la Belleza / Nebulae: The Star Blend of Beauty Tweet

Nebulosas: La Mezcla Estelar de la Belleza / Nebulae: The Star Blend of Beauty

Algunos de los objetos mas facinantes y hermosos del Universo estan formados por gas y polvo interestelar. Sus nombres llegan a nosotros por la semejanza con cosas familiares en nuestro entorno terrestre. La designacion misma que les damos ya da una indicacion de que asi es: Nebulosas, del Latin Nebulae. Espero les gusten tanto como a mi.

Some of the most fascinating and beautiful objects in the universe are made up of gas and dust. Their names come to us by its likeness to familiar things in our terrestrial environment. The same designation that we give it, shows an indication that is this way: Nebulae, from Latin Nebulae. Hope you like them as much as me.

La popular nebulosa "Cabeza de Caballo", desde el Hubble

Eleven years in orbit Hubble observes the popular "Horsehead" nebula

A New View of the Helix Nebula

Butterfly emerges from stellar demise in planetary nebula NGC 6302

IRAS 22036+5306 is making the transition through the protoplanetary, or preplanetary, nebula phase.

M43, sculpting the landscape of dust and gas.

Astronomers call the area a miniature Orion Nebula

 

Mystic Mountain Carina nebula

NGC 1275 Being surrounded by gas that is around 55 million degrees Celsius hot. The entire image is approximately 260 000 light-years across.

NGC 2346 is a so-called planetary nebula, which is ejected from 2 Sun-like stars which are near the ends of their lives.

NGC 6326, a planetary nebula

Nebula NGC 2080, nicknamed the Ghost Head Nebula

Rosette Nebula

The Tarantula nebula, in the closest galaxy to our own: The heart of the LMC

The Boomerang Nebula is a young planetary nebula and the coldest object found in the Universe.

The Eskimo Nebula

The Great Nebula in Orion, an immense, nearby starbirth region, is probably the most famous of all astronomical nebulas. Visible faint to naked eye.

The Hourglass Nebula

The Little Ghost Nebula (NGC 6369)

The Red Spider Nebula Surfing in Sagittarius - not for the faint-hearted

The Spirograph Nebula

The central star IRAS 10082-5647 The divine-looking cloud is a reflection nebula, in this case a young Herbig AeBe

The object, called NGC 2371, is a planetary nebula, the glowing remains of a Sun-like star.

This image shows a small portion of a nebula called the Cygnus Loop.

This image, is a very thin section of a supernova remnant caused by a stellar explosion that occurred more than 1,000 years ago.

V838 Monocerotis (V838 Mon).  Resemble the paint: Starry night, Van Gogh

The so-called Ant nebula (Menzel 3, or Mz 3)

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