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Science


Why sibling stars look alike: Early, fast mixing in star-birth clouds

Sun, 31 Aug 2014 15:03:33 EDT

Early, fast, turbulent mixing of gas within giant molecular clouds -- the birthplaces of stars -- means all stars formed from a single cloud bear the same unique chemical 'tag' or 'DNA fingerprint,' write astrophysicists. Could such chemical tags help astronomers identify our own Sun's long-lost sibling stars?


Astrophysicists report radioactive cobalt in supernova explosion

Fri, 29 Aug 2014 10:34:24 EDT

Astrophysicists have detected the formation of radioactive cobalt during a supernova explosion, lending credence to a corresponding theory of supernova explosions.


Maurício Tuffani: Marina, a elite e as massas de Ortega y Gasset

31 Aug 2014 13:49:00 -0300

A noção de elite na recente declaração de Marina Silva, candidata do PSB à Presidência da República, que teve grande repercussão, merece uma analogia com o que o filósofo espanhol José Ortega y Gasset (1883-1955) chamou de minoria em seu livro "A ... Leia post completo no blog Leia mais (08/31/2014 - 13h49)


Researchers use NASA and other data to look into the heart of a solar storm

Thu, 28 Aug 2014 17:00:49 EDT

Scientists found that the CME contained a rare piece of dense solar filament material. This filament coupled with an unusually fast speed led to the large amount of solar material observed.


Strange Neutrinos from the Sun Detected for the First Time

Wed, 27 Aug 2014 17:00:00 GMT

An underground neutrino detector has found particles produced by the fusion of two protons in the sun’s core

-- Read more on ScientificAmerican.com


Red Planet's climate history uncovered in unique Martian meteorite

Wed, 27 Aug 2014 13:15:53 EDT

Was Mars -- now a cold, dry place -- once a warm, wet planet that sustained life? Research underway may one day answer those questions -- and perhaps even help pave the way for future colonization of the Red Planet. By analyzing the chemical clues locked inside an ancient Martian meteorite known as Black Beauty, scientists are revealing the story of Mars’ ancient, and sometimes startling, climate history.


Early growth of giant galaxy, just 3 billion years after the Big Bang, revealed

Wed, 27 Aug 2014 13:15:51 EDT

The birth of massive galaxies, according to galaxy formation theories, begins with the buildup of a dense, compact core that is ablaze with the glow of millions of newly formed stars. Evidence of this early construction phase, however, has eluded astronomers — until now. Astronomers identified a dense galactic core, dubbed "Sparky," using a combination of data from several space telescopes. Hubble photographed the emerging galaxy as it looked 11 billion years ago, just 3 billion years after the birth of our universe in the big bang.


Atlas desvenda biodiversidade marinha nas profundezas da Antártida

28 Aug 2014 08:01:00 -0300

Um novo atlas contendo um extenso levantamento da vida marinha no Oceano Antártico foi lançado pelo Comitê Científico de Pesquisa Antártica (Scar, na sigla em inglês). Leia mais (08/28/2014 - 08h01)


Mensageiro Sideral: Nada como um asteroide após o outro

28 Aug 2014 05:55:00 -0300

Um grupo de astrônomos amadores brasileiros descobriu nos últimos dois meses nada menos que seis asteroides cujas órbitas os trazem perigosamente perto da Terra. Nenhum deles corre risco de colisão conosco, mas trata-se de um lembrete sinistro de que há ... Leia post completo no blog Leia mais (08/28/2014 - 05h55)


Voyager map details Neptune's strange moon Triton

Fri, 22 Aug 2014 09:35:39 EDT

NASA's Voyager 2 spacecraft gave humanity its first close-up look at Neptune and its moon Triton in the summer of 1989. Like an old film, Voyager's historic footage of Triton has been "restored" and used to construct the best-ever global color map of that strange moon. The map, produced by Paul Schenk, a scientist at the Lunar and Planetary Institute in Houston, has also been used to make a movie recreating that historic Voyager encounter, which took place 25 years ago, on August 25, 1989.


Is Fluoride in Private Wells Causing an IQ Decline?

Wed, 20 Aug 2014 13:00:00 GMT

Excess fluoride, which may damage both brain and bone, is leaching out of granite and into Maine's drinking water—and potentially other New England states

-- Read more on ScientificAmerican.com


More Parents Nixing Anti-Bleeding Shots for Their Newborns

Tue, 19 Aug 2014 13:25:00 GMT

Vitamin K injections, given after birth, can prevent potentially fatal hemorrhaging in infants, but anti-vax parents are extending their fears into a general rejection of all shots

-- Read more on ScientificAmerican.com


Maurício Tuffani: Quem ganha com a devastação em Mato Grosso

27 Aug 2014 02:11:00 -0300

Acabo de chegar a Barra do Garças, no Mato Grosso, onde o pessoal que ainda confunde desmatamento com progresso tem novo motivo para comemoração. Na semana passada, o Estado apareceu mais uma vez em posição de destaque no projeto Degrad,... Leia post completo no blog Leia mais (08/27/2014 - 02h11)


Why NASA studies the ultraviolet sun

Wed, 20 Aug 2014 18:28:10 EDT

You cannot look at the sun without special filters, and the naked eye cannot perceive certain wavelengths of sunlight. Solar physicists must consequently rely on spacecraft that can observe this invisible light before the atmosphere absorbs it.


Rubber Bullets in Missouri Clash Highlight Militarization of America’s Police

Sat, 16 Aug 2014 02:20:00 GMT

Police forces are increasingly turning to so-called nonlethal but dangerous weapons to control conflicts

-- Read more on ScientificAmerican.com