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domingo, 20 de agosto de 2017

Astronomy picture of the day - 2017 August 20 - Time-Lapse: A Total Solar Eclipse

Time-Lapse: A Total Solar Eclipse 
Video Credit & Copyright: Colin Legg
Explanation: Have you ever experienced a total eclipse of the Sun? This time-lapse movie depicts such an eclipse in dramatic detail, seen from Australia in 2012. As the video begins, a slight dimming of the Sun and the surrounding Earth is barely perceptible. As the Moon moves to cover nearly the entire Sun, darkness sweeps in from the left -- the fully blocked part of the Sun. At totality, only the bright solar corona extends past the edges of the Moon, and darkness surrounds you. Distant horizons are still bright, though, as they are not in the darkest part of the shadow. At mid-totality the darkness dips to the horizon below the eclipsed Sun, created by the shadow cone -- a corridor of shadow that traces back to the Moon. As the total solar eclipse ends -- usually after a few minutes -- the process reverses and Moon's shadow moves off to the other side. Tomorrow afternoon's total solar eclipse -- visible as at least a partial eclipse over all of North America -- can be experienced at social gatherings, some of which are being organized by local libraries.

sexta-feira, 18 de agosto de 2017

Astronomy picture of the day - 2017 August 18 - Perseids over the Pyrénées

See Explanation.  Clicking on the picture will download
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Perseids over the Pyrénées 
Image Credit & Copyright: Jean-Francois Graffand
Explanation: This mountain and night skyscape stretches across the French Pyrenees National Park on August 12, near the peak of the annual Perseid meteor shower. The multi-exposure panoramic view was composed from the Col d'Aubisque, a mountain pass, about an hour before the bright gibbous moon rose. Centered is a misty valley and lights from the region's Gourette ski station toward the south. Taken over the following hour, frames capturing some of the night's long bright perseid meteors were aligned against the backdrop of stars and Milky Way.

quinta-feira, 17 de agosto de 2017

Astronomy picture of the day - 2017 August 17 - NGC 2442: Galaxy in Volans

See Explanation.  Clicking on the picture will download
 the highest resolution version available.
NGC 2442: Galaxy in Volans 
Image Credit & CopyrightProcessing - Robert GendlerRoberto Colombari
Data - Hubble Legacy ArchiveEuropean Southern Observatory
Explanation: Distorted galaxy NGC 2442 can be found in the southern constellation of the flying fish, (Piscis) Volans. Located about 50 million light-years away, the galaxy's two spiral arms extending from a pronounced central bar have a hook-like appearance in wide-field images. But this mosaicked close-up, constructed from Hubble Space Telescope and European Southern Observatory data, follows the galaxy's structure in amazing detail. Obscuring dust lanes, young blue star clusters and reddish star forming regions surround a core of yellowish light from an older population of stars. The sharp image data also reveal more distant background galaxies seen right through NGC 2442's star clusters and nebulae. The image spans about 75,000 light-years at the estimated distance of NGC 2442.

Bobby Darin - "Mack The Knife" - Video - Music

"Mack The Knife"

segunda-feira, 14 de agosto de 2017

Texto - Os pirolitos do Mestre Gaudêncio

Foto de Ana Maria Saraiva.
Ai esta o Senhor Gaudencio! ‘bora amigos qu’hoje vai ser igual a todas as quartas-feiras. Gaudêncio oferecia  sempre alguns pirolitos para a malta (e aquele berlinde apetitoso…)

Era uma alegria intensa ;  o mais importante, além da gasosa, eram os brindes na parte escondida de trás da rolha que revelava, de quando em vez, (mas muito raramente uma gasosa, outro pirolito ou então, prémio supremo, um “Canada Dry”).

Pouco importa, éramos tão felizes naqueles tempos. Tudo servia pr’a brincadeira. Era na Escola de Regentes Agrícolas, era o padrinho Chico Boazinha, era a madrinha bondososa, eram as corridas com arco até à “Mitra 2” e os regressos ansiosos por uma gota de agua…

Se o céu existe (ai tenho algumas duvidas), vamos passar tempos memoriais até que… passemos para outra vida. De qualquer forma ficaremos sempre a ganhar.



Playing For Change - "Music always unites Us" - Video - Music

"Music always unites Us"

Astronomy picture of the day - 2017 August 14 - Charon Flyover from New Horizons

Charon Flyover from New Horizons 
Video Credit: NASAJHUAPLSwRI, P. Schenk & J. Blackwell (LPI); Music: Juicy by ALBIS
Explanation: What if you could fly over Pluto's moon Charon -- what might you see? The New Horizons spacecraft did just this in 2015 July as it zipped past Pluto and Charon with cameras blazing. The images recorded allowed for a digital reconstruction of much of Charon's surface, further enabling the creation of fictitious flights over Charon created from this data. One such fanciful, minute-long, time-lapse video is shown here with vertical heights and colors of surface features digitally enhanced. Your journey begins over a wide chasm that divides different types of Charon's landscapes, a chasm that might have formed when Charon froze through. You soon turn north and fly over a colorful depression dubbed Mordor that, one hypothesis holds, is an unusual remnant from an ancient impact. Your voyage continues over an alien landscape rich with never-before-seen craters, mountains, and crevices. The robotic New Horizons spacecraft has now been targeted at Kuiper Belt object 2014 MU 69, which it should zoom past on New Year's Day 2019.