Foto - "Baia de Baracoa" - Cuba - 27-10-2010

"Baia de Baracoa"

Cuba, 27-10-2010

JoanMira

Foto - "Barreiro - Alburrica" - 20-07-2011

"Barreiro - Alburrica"

20-07-2011

JoanMira

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

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.

Astronomy picture of the day - 2015 April 26 - Planetary Nebula Mz3: The Ant Nebula

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.

Fot'Arte - "Sweet Main Road to Hell"

"Sweet Main Road to Hell"

25-04-2015

JoanMira