"Barreiro - Alburrica"
20-07-2011
JoanMira
2015-04-26
Che Guevara
“No creo que seamos parientes muy cercanos, pero si usted es capaz de temblar de indignación cada vez que se comete una injusticia en el mundo, somos compañeros, que es más importante.”
Aconteceu a 26 de abril de 1986 - Acidente Nuclear de Chernobil
 1986 - Acidente Nuclear de Chernobil |
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A 26 de Abril de 1986, ocorre um acidente na central nuclear de Chernobyl, no norte da Ucrânia. Segundo a ONU, teriam morrido, como consequência deste desastre, 47 trabalhadores e 9 crianças com cancro da tiróide. Associações ecologistas discordam deste número, considerando existirem milhares de vítimas.
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Astronomy picture of the day - 2015 April 26 - Planetary Nebula Mz3: The Ant Nebula
Image Credit: R. Sahai (JPL) et al., Hubble Heritage Team, ESA, NASA
Explanation: Why isn't this ant a big sphere? Planetary nebula Mz3 is being cast off by a star similar to our Sun that is, surely, round. Why then would the gas that is streaming away create an ant-shaped nebula that is distinctly not round? Clues might include the high 1000-kilometer per second speed of the expelled gas, the light-year long length of the structure, and the magnetism of the star visible above at the nebula's center. One possible answer is that Mz3 is hiding a second, dimmer star that orbits close in to the bright star. A competing hypothesis holds that the central star's own spin and magnetic field are channeling the gas. Since the central star appears to be so similar to our own Sun,astronomers hope that increased understanding of the history of this giant space ant can provide useful insight into the likely future of our own Sun and Earth.
2015-04-25
Astronomy picture of the day - 2015 April 25 - Cluster and Starforming Region Westerlund 2
Image Credit & Copyright: NASA, ESA, the Hubble Heritage Team
(STScI / AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team
Explanation: Located 20,000 light-years away in the constellation Carina, the young cluster and starforming region Westerlund 2 fills this cosmic scene. Captured with Hubble's cameras in near-infrared and visible light, the stunning image is a celebration of the 25th anniversary of the launch of the Hubble Space Telescope on April 24, 1990. The cluster's dense concentration of luminous, massive stars is about 10 light-years across. Strong winds and radiation from those massive young stars have sculpted and shaped the region's gas and dust, into starforming pillars that point back to the central cluster. Red dots surrounding the bright stars are the cluster's faint newborn stars, still within their natal gas and dust cocoons. But brighter blue stars scattered around are likely not in the Westerlund 2 cluster and instead lie in the foreground of the Hubble anniversary field of view.
Aconteceu a 25 de abril de...1974 - A Revolução dos Cravos.
Monumento ao 25 de Abril em Grândola, vila morena
1974 - Revoluçáo dos Cravos (25 DE ABRIL)
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A 25 de abril de 1974, ocorre a Revolução dos Cravos, levada a cabo pelo Movimento das Forças Armadas, que põe termo, em Portugal, ao regime ditatorial do Estado Novo.
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