viernes, 25 de marzo de 2016

KALEIDOSCOPIO ▲ Hubble Looks Into a Cosmic Kaleidoscope | NASA

Hubble Looks Into a Cosmic Kaleidoscope | NASA

Hubble Looks Into a Cosmic Kaleidoscope

Pink, purple and blue colliding galaxy clusters

At first glance, this cosmic kaleidoscope of purple, blue and pink offers a strikingly beautiful — and serene — snapshot of the cosmos. However, this multi-colored haze actually marks the site of two colliding galaxy clusters, forming a single object known as MACS J0416.1-2403 (or MACS J0416 for short).
MACS J0416 is located about 4.3 billion light-years from Earth, in the constellation of Eridanus. This image of the cluster combines data from three different telescopes: the NASA/ESA Hubble Space Telescope (showing the galaxies and stars), the NASA Chandra X-ray Observatory (diffuse emission in blue), and the NRAO Jansky Very Large Array (diffuse emission in pink). Each telescope shows a different element of the cluster, allowing astronomers to study MACS J0416 in detail.
As with all galaxy clusters, MACS J0416 contains a significant amount of dark matter, which leaves a detectable imprint in visible light by distorting the images of background galaxies. In this image, this dark matter appears to align well with the blue-hued hot gas, suggesting that the two clusters have not yet collided; if the clusters had already smashed into one another, the dark matter and gas would have separated. MACS J0416 also contains other features — such as a compact core of hot gas — that would likely have been disrupted had a collision already occurred.
Together with five other galaxy clusters, MACS J0416 is playing a leading role in the Hubble Frontier Fields program, for which this data was obtained. Owing to its huge mass, the cluster is in fact bending the light of background objects, acting as a magnifying lens. Astronomers can use this phenomenon to find galaxies that existed only hundreds of million years after the big bang.
For more information on both Frontier Fields and the phenomenon of gravitational lensing, see Hubblecast 90: The final frontier.
Text credit: European Space Agency

Image credit: NASA, ESA, CXC, NRAO/AUI/NSF, STScI, and G. Ogrean (Stanford University), Acknowledgment: NASA, ESA, and J. Lotz (STScI), and the HFF team
Last Updated: March 25, 2016
Editor: Ashley Morrow
Pink, purple and blue colliding galaxy clusters
el dispensador dice:
si tienes tu cristal,
sólo necesitas de tu ojo...
si tienes tu universo,
usa la mirilla del espíritu,
y has de tu alma un cerrojo,
para que nadie espíe,
lo que se debe contemplar solo.
MARZO 25, 2016.-

Has / haz

a) has
Se trata de la forma correspondiente a la segunda persona del singular del presente de indicativo del verbo haber (yo he, tu/vos has, él ha, nosotros hemos, vosotros habéis, ellos/ustedes han), con el que se forman los tiempos compuestos de la conjugación. Así, la forma has, seguida del participio en -o del verbo que se está conjugando, da lugar a la segunda persona del singular del pretérito perfecto compuesto (o antepresente) del modo indicativo:
 Has llegado tarde.
¿Has ido a ver a tu padre?
Esta forma se emplea además como segunda persona del singular de la perífrasis verbal  haber de + infinitivo, que denota obligación o necesidad y equivale a la más frecuente hoy tener que + infinitivo:
Has de estudiar más. [= Tienes que estudiar más].              
Has de saber que serás castigado. [= Tienes que saber que serás castigado].
b) haz
Como verbo, se trata de la forma de imperativo correspondiente al pronombre tú del verbo hacer:
Haz lo que te digo o no te dejaré salir.
Haz lo que tengas que hacer.
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