20 outubro 2014

Extreme Ultraviolet Image of a Significant Solar Flare



The sun emitted a significant solar flare on Oct. 19, 2014, peaking at 1:01 a.m. EDT. NASA's Solar Dynamics Observatory, which is always observing the sun, captured this image of the event in extreme ultraviolet wavelength of 131 Angstroms – a wavelength that can see the intense heat of a flare and that is typically colorized in teal. This flare is classified as an X1.1-class flare. X-class denotes the most intense flares, while the number provides more information about its strength. An X2 flare is twice as intense as an X1, and an X3 is three times as intense. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. > More: NASA's SDO Observes an X-class Solar Flare Image Credit: NASA/Solar Dynamics Observatory



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October 20th 1632: Christopher Wren born On this day in 1632,...



Christopher Wren (1632 - 1723) by Godfrey Kneller





Final design of St. Paul's Cathedral



October 20th 1632: Christopher Wren born


On this day in 1632, famous British architect Christopher Wren was born in East Knoyle, Wiltshire. The son of a rector, Wren received a top education at Westminster School and then the prestigious Oxford University. Wren’s initial intellectual interest was in astronomy and physics but this eventually developed into architecture during the 1660s. When the Great Fire of London in 1666 destroyed a large portion of the city, Wren seized the opportunity and became a chief architect of the rebuilt capital. He designed fifty-two new churches for London, most famously St. Paul’s Cathedral. St. Paul’s was London’s tallest building until 1962, having survived the Blitz during World War Two. The cathedral remains a major British landmark and is used for state services including the funeral of Winston Churchill (and more recently Margaret Thatcher), monarch’s jubilee celebrations, and the royal wedding of Prince Charles and Diana Spencer. Wren’s work in London caught the attention of the crown and he received multiple royal commissions including designing the Royal Observatory at Greenwich, the front facade of Hampton Court Palace and several hospitals. Christopher Wren died on February 25th 1723 aged 91 after having caught a bad chill. His gravestone in St Paul’s Cathedral features the Latin inscription "Reader, if you seek his memorial - look around you."


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(From UNICEF)





(From UNICEF)


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In Myanmar, everyone drives on the right. Because a wizard told...





In Myanmar, everyone drives on the right. Because a wizard told the ruling general at the time to do so. In 1970!


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On This Day in the History of Psychology (20th October...





On This Day in the History of Psychology (20th October 1859)


John Dewey was born.


If you like psychology, you’ll love —> http://ift.tt/1eWNk1f


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