2016-03-01

Astronomy picture of the day - 2016 March 1 - NGC 3310: A Starburst Spiral Galaxy

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NGC 3310: A Starburst Spiral Galaxy 
Image Credit & Copyright: AAO ITSO OfficeGemini Obs./AURA & T. A. Rector (U. Alaska Anchorage)
Explanation: The party is still going on in spiral galaxy NGC 3310. Roughly 100 million years ago, NGC 3310 likely collided with a smaller galaxy causing the large spiral galaxy to light up with a tremendous burst of star formation. The changing gravity during the collision created density waves that compressed existing clouds of gas and triggered the star-forming party. The featured image from the Gemini North Telescope shows the galaxy in great detail, color-coded so that pink highlights gas while white and blue highlight stars. Some of the star clusters in the galaxy are quite young, indicating that starburst galaxies may remain in star-burst mode for quite some time. NGC 3310 spans about 50,000 light years, lies about 50 million light years away, and is visible with a small telescope towards the constellation of Ursa Major.

2016-02-29

Cura do Cancro: as boas noticias continuam

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Qualquer avanço na área do tratamento do cancro é recebido como uma boa notícia. Os resultados do ensaio clínico conduzido por Stanley Ridel, investigador no Centro Fred Hutchinson de Investigação em Cancro (Estados Unidos), não foram exceção. Embora considerem que esta investigação vem reforçar a importância da imunoterapia, os cientistas portugueses entrevistados pelo Observador referem que a técnica não é nova. Os investigadores não duvidam que os resultados sejam promissores, mas lembram que esta ainda é uma fase inicial dos ensaios clínicos.

“Do ponto de vista da eficácia terapêutica em leucemia linfoblástica aguda [LLA] avançada pode dizer-se que [a técnica] é revolucionária: 94% de remissões completas seriam impossíveis com qualquer outro tratamento disponível”, disse ao Observador Bruno Silva Santos, vice-diretor do Instituto de Medicina Molecular (IMM) da Universidade de Lisboa. Mas o investigador, que também faz investigação em imunoterapia, disse que, em termos conceptuais, a técnica não é novidade e já se sabia que podia “ser aplicável a tumores de linfócitos B [células B do sistema imunitário], como é o caso dos doentes de LLA ou de certos casos de linfoma”.

Ler mais em:
http://observador.pt/especiais/cancro-as-ultimas-descobertas-valem-mesmo-tanta-euforia/

Observador - Portugal

Roberto Carlos e Anitta - "Ternura" - Video - Musica - Ao vivo

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"Ternura"

Roberto Carlos e Erasmo Carlos - "Amigo" - Video - Musica - Ao vivo

"Amigo"

Astronomy picture of the day - 2016 February 29 - Julius Caesar and Leap Days

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Julius Caesar and Leap Days 
Image Credit: Classical Numismatic Group, Inc.Wikimedia
Explanation: Today, February 29th, is a leap day - a relatively rare occurrence. In 46 BC, Julius Caesar, featured here in a self-decreed minted coin, created a calendar system that added one leap day every four years. Acting on advice by Alexandrian astronomer Sosigenes, Caesar did this to make up for the fact that the Earth's year is slightly more than 365 days. In modern terms, the time it takes for the Earth to circle the Sun is slightly more than the time it takes for the Earth to rotate 365 times (with respect to the Sun -- actually we now know this takes about 365.24219 rotations). So, if calendar years contained 365 days they would drift from the actual year by about 1 day every 4 years. Eventually July (named posthumously for Julius Caesar himself) would occur during the northern hemisphere winter! By adopting a leap year with an extra day every four years, the calendar year would drift much less. This Julian Calendar system was used until the year 1582 when Pope Gregory XIII provided further fine-tuning when he added that leap days should not occur in years ending in "00", unless divisible by 400. This Gregorian Calendar system is the one in common use today.

A herdeira ultimamente nascida: Haize!



Haize - 28-02-2016
(My last little baby... e o carimbo de "fabrica" esta na vista direita mais pequena...)

2016-02-28

Astronomy picture of the day - 2016 February 28 - IC 1848: The Soul Nebula

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IC 1848: The Soul Nebula 
Image Credit & Copyright: Roberto Colombari
Explanation: Stars are forming in the Soul of the Queen of Aethopia. More specifically, a large star forming region called the Soul Nebula can be found in the direction of the constellation Cassiopeia, who Greek mythology credits as the vain wife of a King who long ago ruled lands surrounding the upper Nile river. The Soul Nebula houses several open clusters of stars, a large radio source known as W5, and huge evacuated bubbles formed by the winds of young massive stars. Located about 6,500 light years away, the Soul Nebula spans about 100 light years and is usually imaged next to its celestial neighbor the Heart Nebula (IC 1805). The featured image appears mostly red due to the emission of a specific color of light emitted by excited hydrogen gas.

2016-02-27

Astronomy picture of the day - 2016 February 27 - Northern Pluto

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Northern Pluto 
Image Credit: NASAJohns Hopkins Univ./APLSouthwest Research Institute 
Explanation: Gaze across the frozen canyons of northern Pluto in this contrast enhanced color scene, imaged last July by the New Horizons spacecraft. Currently known as Lowell Regio, the region has been informally named for Percival Lowell, founder of the Lowell Observatory. Also famous for his speculation that there were canals on Mars, in 1906 Lowell started the search that ultimately led to Pluto's discovery. Pluto's North Pole itself is above and left of center in the the frame. The pale bluish floor of the broad canyon on the left is about 70 kilometers (45 miles) wide, running vertically toward the south. Higher elevations take on a yellowish hue. New Horizon's measurements have determined that in addition to nitrogen ice, methane ice is abundant across northern Pluto's Lowell Regio.

2016-02-26

Astronomy picture of the day - 2016 February 26 - The Tarantula Nebula

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The Tarantula Nebula 
Image Credit & CopyrightProcessing - Robert GendlerRoberto Colombari
Data - Hubble Tarantula TreasuryEuropean Southern Observatory 
Explanation: The Tarantula Nebula is more than a thousand light-years in diameter, a giant star forming region within nearby satellite galaxy the Large Magellanic Cloud, about 180 thousand light-years away. The largest, most violent star forming region known in the whole Local Group of galaxies, the cosmic arachnid sprawls across this spectacular composite view constructed with space- and ground-based image data. Within the Tarantula (NGC 2070), intense radiation, stellar winds and supernova shocks from the central young cluster of massive stars, cataloged as R136, energize the nebular glow and shape the spidery filaments. Around the Tarantula are other star forming regions with young star clusters, filaments, and blown-out bubble-shaped clouds In fact, the frame includes the site of the closest supernova in modern times, SN 1987A, at the lower right. The rich field of view spans about 1 degree or 2 full moons, in the southern constellation Dorado. But were the Tarantula Nebula closer, say 1,500 light-years distant like the local star forming Orion Nebula, it would take up half the sky.

2016-02-25

Texto - E a minha tia Celeste cantava o Fado - 1957


Naqueles belos anos todos cantavam ; o João Maria Tudela, a Emissora Nacional, o Rádio Clube… Beatriz Costa, Maria de Lurdes Rezende…e quando cansados de tanto cantar na Rádio, vinham alguns  reclames tipo, “Tide a lavar e eu a descansar”… E chegava, enfim, o que mais ansiávamos: Os Parodiantes de Lisboa! “Patilhas e Ventoinha” marcaram para sempre a minha meninice…

Televisão, Internet, tecnologias que hoje nos são habituais, nem sequer imaginar…

Telefone não existia para a nossa classe; íamos a casa de uns e outros sem prevenir nem hora marcada; éramos recebidos com a naturalidade dos familiares bem-vindos…

De quando em vez, ouvia-se cantar o fado; por vezes numa rara telefonia… Mas, na maioria dos casos, eram vozes bem conhecidas; a minha tia Celeste era uma delas!

E eram as incessantes corridas entre putos; partiam da avenida da Bélgica, davam a volta ao quarteirão, passando pelo Beco da Adega e, por vezes, atravessavam a “avenida” sem carros. Cruzavam por vezes velhas carrossas com rodas em “cauthcu” que as tornavam um pouco mais silenciosas.

Ao fim do dia, quase ao anoitecer, era tempo de começar as partidas: tocar às campainhas, atirar lixo contra as montras, desafiar capicuas (guardas republicanos a cavalo), levar de “cavalo marinho” para alguns, “curtir” como se diz hoje em dia.

Foi a minha meninice no Barreiro; tinha então todos os seres amados, entretanto desaparecidos, de que  tenho todas as saudades do Mundo!

Bordeaux, 25 de Fevereiro de 2016


JoanMira