2014-08-13
Robin Williams - La tristeza del cómico
Astronomy picture of the day 13-08-2014
Image Credit: Hubble, Large Binocular Telescope,Subaru Telescope; Composition & Copyright: Robert Gendler
Explanation: It is a familiar sight to sky enthusiasts with even a small telescope. There is much more to the Ring Nebula (M57), however, than can be seen through a small telescope. The easily visible central ring is about one light-year across, but this remarkably deep exposure - a collaborative effort combining data from three different large telescopes -exploresthe looping filaments of glowing gas extending much farther from the nebula'scentral star. This remarkable composite image includes narrowband hydrogen image, visible light emission, and infrared light emission. Of course, in thiswell-studied example of aplanetary nebula, the glowing material does not come from planets. Instead, the gaseous shroud represents outer layers expelled from a dying, sun-like star. The Ring Nebula is about 2,000 light-years away toward the musicalconstellation Lyra.
2014-08-12
Astronomy Picture of the Day - Collapse in Hebes Chasma on Mars
2014 August 12

Collapse in Hebes Chasma on Mars
Image Credit & Copyright: ESA/DLR/FU Berlin (G. Neukum)
Image Credit & Copyright: ESA/DLR/FU Berlin (G. Neukum)
Explanation: What's happened in Hebes Chasma on Mars? Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Since the depression is unconnected to other surface features, it is unclear where the internal material went. Inside Hebes Chasma is Hebes Mensa, a 5 kilometer high mesa that appears to have undergone an unusual partial collapse -- a collapse that might be providing clues. The above image, taken by the robotic Mars Express spacecraft currently orbiting Mars, shows great details of the chasm and the unusual horseshoe shaped indentation in the central mesa. Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. A recent hypothesis holds that salty rock composes some lower layers in Hebes Chasma, with the salt dissolving in melted ice flows that drained through holes into an underground aquifer.
2014-08-11
Imagens do Mundo - Super lua - Varsovia - Polonia
Estatua de la iglesia de la Santa Cruz en Varsovia, Polonia.
Alik Keplicz (AP)
Imagens do Mundo - Super lua - China
La silueta de un avión en pleno vuelo que parece dirigirse a la superluna vista desde Kunming, al suroete de China.
(AFP)
Imagens do Mundo - Super lua em Brasilia
En una llanura de Brasilia, Brasil.
UESLEI MARCELINO (REUTERS)
Imagens do Mundo - Super lua em Trento - Italia
Sobre las montañas de Dolomiti cerca de Trento, en el norte de Italia.
GIUSEPPE CACACE (AFP)
Imagens do Mundo - Super lua em Sidney - Australia
Wanda, en Sidney (Australia).
JASON REED (Reuters)
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