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https://hubpages.com/education/Thought-Experiments-to-Help-You-Sleep-Emc2

It's the smallest physics equation most people have ever heard of, and certainly the most famous of all time. E=mc2 is often shrouded in mystery, with a visionary, pipe-smoking, crazy-haired Einstein coming to mind with a genius so far above the rest of mere mortals that there is no way we could possibly comprehend what he was thinking or what is meant by this. On the contrary, though, Albert Einstein was about 25 years old when he came up with this mind-blowing, science-altering, elegant equation, and the concept itself isn't actually all that hard to grasp.



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The risky 2015 BZ509.
(in Spanish)

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FRB 121102 seems to be particular.
(in Spanish)

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Dark energy as an effect of a rotating Universe. (Nice model)
(in Spanish)

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Galaxy Centaurus A.
The image was captured by the 1.5-metre Danish telescope at the ESO’s La Silla Observatory in Chile.

Credit:
ESO/IDA/Danish 1.5 m/R. Gendler, J.-E. Ovaldsen & S. Guisard (www.eso.org/~sguisard) (ESO)
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Turquoise-tinted plumes in the Large Magellanic Cloud
This image shows part of the Large Magellanic Cloud (LMC), a small nearby galaxy that orbits our galaxy, the Milky Way, and appears as a blurred blob in our skies. The NASA/ESA Hubble Space Telescope has peeked many times into this galaxy, releasing stunning images of the whirling clouds of gas and sparkling stars.

This image shows part of the Tarantula Nebula's outskirts. This famously beautiful nebula, located within the LMC, is a frequent target for Hubble (heic1206, heic1402). 

In most images of the LMC the colour is completely different to that seen here. This is because, in this image, a different set of filters was used. The customary R filter, which selects the red light, was replaced by a filter letting through the near-infrared light. In traditional images, the hydrogen gas appears pink because it shines most brightly in the red. Here however, other less prominent emission lines dominate in the blue and green filters.

Image Credit: ESA/Hubble & NASA
Acknowledgement: Josh Barrington
https://www.spacetelescope.org/images/potw1441a/
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This image from Hubble's Wide Field Camera 3 (WFC3) shows a section of NGC 1448, a spiral galaxy located about 50 million light-years from Earth in the little-known constellation of Horologium (The Pendulum Clock). We tend to think of spiral galaxies as massive and roughly circular celestial bodies, so this glittering oval does not immediately appear to fit the visual bill. What's going on?

Imagine a spiral galaxy as a circular frisbee spinning gently in space. When we see it face on, our observations reveal a spectacular amount of detail and structure -- a great example from Hubble is the telescope's view of Messier 51, otherwise known as the Whirlpool Galaxy. However, the NGC 1448 frisbee is very nearly edge-on with respect to Earth, giving it an appearance that is more oval than circular. The spiral arms, which curve out from NGC 1448's dense core, can just about be seen.

Although spiral galaxies might appear static with their picturesque shapes frozen in space, this is very far from the truth. The stars in these dramatic spiral configurations are constantly moving as they orbit around the galaxy's core, with those on the inside making the orbit faster than those sitting further out."

This makes the formation and continued existence of a spiral galaxy's arms something of a cosmic puzzle, because the arms wrapped around the spinning core should become wound tighter and tighter as time goes on -- but this is not what we see. This is known as the winding problem.

This image from Hubble's Wide Field Camera 3 (WFC3) shows a section of NGC 1448, a spiral galaxy located about 50 million light-years from Earth in the little-known constellation of Horologium (The Pendulum Clock).

Credit: ESA/Hubble & NASA

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La UE propone prepararse ante una gran tormenta solar
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