Dos hombres practican ejercicio entre unos árboles en las afueras de Srinagar (India).
DANISH ISMAIL REUTERS
2016-12-08
Imagenes del Mundo - Un avion a 24.000 metros
El avión solar biplaza de la misión SolarStratos, que aspira a convertirse en el primero en llegar en 2018 a más de 24.000 metros de altura. La expedición, comandada por el aventurero suizo Raphaël Domjan y su equipo, tiene previsto llevarse a cabo en 2018. EFE
Palacios cariocas - Palácio Arariboia
O palácio, inaugurado em 1910, foi tombado pela Prefeitura de Niterói em 1995 e atualmente abriga a Secretaria Municipal de Fazenda.
Astronomy picture of the day - 2016 December 8 - Whirlpool with Comets
Image Credit & Copyright: José J. Chambó (Cometografia)
Explanation: Not a comet, bright spiral galaxy Messier 51 is popularly known as the Whirlpool Galaxy. Just off the handle of the Big Dipper in northern skies, you can spot it at the upper left in this image from December 1st. The pretty 4 by 2.5 degree wide field of view does contain two comets though. Different in appearance, both comets are new visitors to the inner Solar System and are currently faint telescopic objects, highest above northern horizons in morning twilight. At lower left newly discovered comet NEOWISE (C/2016 U1) shows off a round fuzzy coma in the greenish light of diatomic carbon gas fluorescing in sunlight. Sunlight reflects from dust in the coma and stubby tail of comet Johnson (C/2015 V2) at upper right.
2016-12-07
Expressões populares portuguesas - Fazer tabua rasa
Significado: Esquecer completamente um assunto para recomeçar em novas bases.
Origem: A tabula rasa , no latim, correspondia a uma tabuinha de cera onde nada estava escrito. A expressão foi tirada, pelos empiristas, de Aristóteles, para assim chamarem ao estado do espírito que, antes de qualquer experiência, estaria, em sua opinião, completamente vazio. Também John Locke (1632 1704), pensador inglês, em oposição a Leibniz e Descartes, partidários do inatísmo, afirmava que o homem não tem nem ideias nem princípios inatos, mas sim que os extrai da vida, da experiência. «Ao começo», dizia Locke, «a nossa alma é como uma tábua rasa, limpa de qualquer letra e sem ideia nenhuma. Tabula rasa in qua nihil scriptum. Como adquire, então, as ideias? Muito simplesmente pela experiência.»
Palacios cariocas - Câmara Municipal de Niterói
Localizada Praça da República, em Niterói, a Câmara Municipal faz parte do Centro Cívico juntamente com a Delegacia, o Fórum, o Liceu e a Biblioteca Estadual.
Aqui funcionou entre os anos de 1917 e 1975 o Palácio da Assembleia Legislativa do Estado do Rio de Janeiro, quando Niterói era a capital do estado.
Atualmente abriga diversas exposições e o arquivo público.
Astronomy picture of the day - 2016 December 7 - NGC 4696: Filaments around a Black Hole
Image Credit: NASA, ESA, Hubble, A. Fabian
Explanation: What's happening at the center of elliptical galaxy NGC 4696? There, long tendrils of gas and dust have been imaged in great detail as shown by this recently released image from the Hubble Space Telescope. These filaments appear to connect to the central region of the galaxy, a region thought occupied by a supermassive black hole. Speculation holds that this black hole pumps out energy that heats surrounding gas, pushes out cooler filaments of gas and dust, and shuts down star formation. Balanced by magnetic fields, these filaments then appear to spiral back in toward and eventually circle the central black hole. NGC 4696 is the largest galaxy in the Centaurus Cluster of Galaxies, located about 150 million light years from Earth. The featured image shows a region about 45,000 light years across.
2016-12-06
Astronomy picture of the day - 2016 December 6 - Aurora over Jupiter's South Pole from Juno
Image Credit: NASA, JPL-Caltech, SwRI, ASI, INAF, JIRAM
Explanation: Why is there a glowing oval over Jupiter's South Pole? Aurora. Near the closest part of its first pass near Jupiter in August, NASA's robotic spacecraft Juno captured this dramatic infrared image of a bright auroral ring. Auroras are caused by high energy particles from the Sun interacting with a planet's magnetic field, and ovals around magnetic poles are common. Data from Juno are giving preliminary indications that Jupiter's magnetic field and aurorae are unexpectedly powerful and complex. Unfortunately, a computer glitch caused Juno to go into safe mode during its last pass near the Jovian giant in September. That glitch has now been resolved, making Juno ready for its next pass over Jupiter's cloud tops this coming Sunday.
2016-12-05
Astronomy picture of the day - 2016 December 5 - Lightning over Colorado
Image Credit & Copyright: Joe Randall
Explanation: Have you ever watched a lightning storm in awe? Join the crowd. Oddly, nobody knows exactly how lightning is produced. What is known is that charges slowly separate in some clouds causing rapid electrical discharges (lightning), but how electrical charges get separated in clouds remains a topic of much research. Lightning usually takes a jagged course, rapidly heating a thin column of air to about three times the surface temperature of the Sun. The resulting shock wave starts supersonically and decays into the loud sound known as thunder. Lightning bolts are common in clouds during rainstorms, and on average 44 lightning bolts occur on the Earth every second. Pictured, over 60 images were stacked to capture the flow of lightning-producing storm clouds in July over Colorado Springs, Colorado, USA.
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