04 agosto 2017

Gravity s Grin


Albert Einstein's general theory of relativity, published over 100 years ago, predicted the phenomenon of gravitational lensing. And that's what gives these distant galaxies such a whimsical appearance, seen through the looking glass of X-ray and optical image data from the Chandra and Hubble space telescopes. Nicknamed the Cheshire Cat galaxy group, the group's two large elliptical galaxies are suggestively framed by arcs. The arcs are optical images of distant background galaxies lensed by the foreground group's total distribution of gravitational mass. Of course, that gravitational mass is dominated by dark matter. The two large elliptical "eye" galaxies represent the brightest members of their own galaxy groups which are merging. Their relative collisional speed of nearly 1,350 kilometers/second heats gas to millions of degrees producing the X-ray glow shown in purple hues. Curiouser about galaxy group mergers? The Cheshire Cat group grins in the constellation Ursa Major, some 4.6 billion light-years away.

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Two medical students in Afghanistan, with their teacher, circa...



Two medical students in Afghanistan, with their teacher, circa 1960s.

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alucards-fine-ass: historical-nonfiction: The Northern Bald...



alucards-fine-ass:

historical-nonfiction:

The Northern Bald Ibis was one of the earliest officially protected species in the world. The Archbishop of Salzburg decreed it a protected species in 1504!  Despite the decree, the Northern Bald Ibis still died out in Europe and today only about 500 wild birds remain in Morocco and Syria.

They have them at my most local zoo.
When we go they are my favourites to visit.
We refer to them as The Flock Of Plague Doctors in my house

Who do we have to petition to get the Northern Bald Ibis renamed as “Plague Doctor Bird”

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Nasa está contratando ‘protetor planetário’

O novo funcionário será encarregado, entre outras coisas, de proteger a Terra da contaminação alienígena.

A posição, que vale US$ 187.000 por ano, envolverá inicialmente a garantia de que as bactérias e outros contaminantes da Terra não façam o caminho para Marte ou outros corpos planetários.

“A proteção planetária está preocupada com a prevenção da contaminação orgânica e biológica na exploração espacial humana e robótica”, diz o trabalho.

“A NASA mantém políticas de proteção planetária, aplicáveis a todas as missões de voo espacial que possam transportar intencionalmente ou involuntariamente organismos terrestres e constituintes orgânicos para os planetas ou outros órgãos do sistema solar e qualquer missão que empregue uma nave espacial que se destine a retornar à Terra e sua biosfera com amostras de alvos extraterrestres de exploração”.

É provável que o novo funcionário desempenhe um papel proeminente na preparação de futuras explorações à Marte da NASA para o lançamento em 2020, bem como na supervisão do projeto da missão planejada da agência espacial para a Europa.

Sob o Tratado do Espaço Exterior de 1967, qualquer missão espacial deve ter menos de 1 em 10.000 chances de contaminar um mundo alienígena – uma regra que é particularmente importante quando esses mundos podem abrigar a vida.

Assegurar que uma missão de retorno da amostra não contamine a Terra também é de extrema importância.



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NASA's Solar Dynamics Observatory Watches a Sunspot


On July 5, 2017, NASA’s Solar Dynamics Observatory watched an active region — an area of intense and complex magnetic fields — rotate into view on the Sun. This image shows a blended view of the sunspot in visible and extreme ultraviolet light, revealing bright coils arcing over the active region — particles spiraling along magnetic field lines.

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The Northern Bald Ibis was one of the earliest officially...



The Northern Bald Ibis was one of the earliest officially protected species in the world. The Archbishop of Salzburg decreed it a protected species in 1504!  Despite the decree, the Northern Bald Ibis still died out in Europe and today only about 500 wild birds remain in Morocco and Syria.

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Simpatia para ele ligar, a Simpatia do Santo Antônio amarrado

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