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Science


NASA's Chandra X-ray Observatory celebrates 15th anniversary

Tue, 22 Jul 2014 12:48:50 EDT

Fifteen years ago, NASA's Chandra X-ray Observatory was launched into space aboard the Space Shuttle Columbia. Since its deployment on July 23, 1999, Chandra has helped revolutionize our understanding of the universe through its unrivaled X-ray vision.


NASA's Fermi finds a 'transformer' pulsar

Tue, 22 Jul 2014 12:04:52 EDT

In late June 2013, an exceptional binary containing a rapidly spinning neutron star underwent a dramatic change in behavior never before observed. The pulsar's radio beacon vanished, while at the same time the system brightened fivefold in gamma rays, the most powerful form of light, according to measurements by NASA's Fermi Gamma-ray Space Telescope.


Hubble traces halo of a galaxy more accurately than ever before: An in-depth look at giant elliptical galaxy Centaurus A

Tue, 22 Jul 2014 10:22:43 EDT

Astronomers have probed the extreme outskirts of the stunning elliptical galaxy Centaurus A. The galaxy's halo of stars has been found to extend much further from the galaxy's center than expected and the stars within this halo seem to be surprisingly rich in heavy elements. This is the most remote portion of an elliptical galaxy ever to have been explored.


Stephen E. Fienberg: "Innovation Is a Process That Itself Requires Investment"

Tue, 22 Jul 2014 12:45:00 GMT

Written testimony for the U.S. Senate Committee on Commerce, Science and Transportation hearing "The Federal Research Portfolio: Capitalizing on Investments in R&D" held on July 17, 2014

-- Read more on ScientificAmerican.com


Mariette DiChristina: "Science Is an Engine of Human Prosperity"

Tue, 22 Jul 2014 12:30:00 GMT

Written testimony for the U.S. Senate Committee on Commerce, Science and Transportation hearing "The Federal Research Portfolio: Capitalizing on Investments in R&D" held on July 17, 2014

-- Read more on ScientificAmerican.com


Looking back at the Jupiter crash 20 years later

Fri, 18 Jul 2014 10:30:12 EDT

Twenty years ago, human and robotic eyes observed the first recorded impact between cosmic bodies in the solar system, as fragments of comet Shoemaker-Levy 9 slammed into the atmosphere of Jupiter. Between July 16 and July 22, 1994, space- and Earth-based assets managed by NASA's Jet Propulsion Laboratory in Pasadena, California, joined an armada of other NASA and international telescopes, straining to get a glimpse of the historic event.


Albinismo é mais comum entre a população negra

22 Jul 2014 02:00:00 -0300

O albinismo é um problema genético que causa uma deficiência na produção de melanina (proteína que dá cor à pele e ao cabelo e protege contra a radiação ultravioleta solar). Por isso, pessoas albinas têm maior risco de envelhecimento precoce e de câncer de pele. Também costumam ter baixa visão. "Mas essas não são suas únicas dificuldades. Frequentemente os albinos sofrem com a exclusão social e a falta de atenção na saúde pública", afirma Marcus Maia, coordenador do programa Pró-Albino da Sociedade Brasileira de Dermatologia. Leia mais (07/22/2014 - 02h00)


Rosetta spacecraft approaching twofold comet

Fri, 18 Jul 2014 10:20:59 EDT

As the European Space Agency's spacecraft Rosetta is slowly approaching its destination, comet 67P/Churyumov-Gerasimenko, the comet is again proving to be full of surprises. New images obtained by OSIRIS, the onboard scientific imaging system, confirm the body's peculiar shape hinted at in earlier pictures. Comet 67P is obviously different from other comets visited so far.


Proton Spin Mystery Gains a New Clue

Mon, 21 Jul 2014 13:00:00 GMT

Physicists long assumed a proton’s spin came from its three constituent quarks. New measurements suggest particles called gluons make a significant contribution

-- Read more on ScientificAmerican.com


Should the Apollo Lunar Landing Sites Be Protected?

Sat, 19 Jul 2014 13:00:00 GMT

On the anniversary of the first moon landing many wonder what will become of the Apollo sites and their artifacts  

-- Read more on ScientificAmerican.com


Ataques sexuais são comuns em pesquisas de campo, diz estudo

21 Jul 2014 12:03:00 -0300

Um estudo por meio de entrevistas e questionários respondidos por pesquisadores e estudantes de 30 países apontou que 18% dos participantes relataram terem sofrido agressões sexuais de seus superiores ou de outros colegas em trabalhos de campo. O trabalho foi publicado na quarta-feira (16) pela revista eletrônica "PLoS One", da Biblioteca Pública da Ciência, dos Estados Unidos. Os ataques relatados envolveram desde contatos físicos não desejados a estupros. Eles foram mais frequentes em mulheres, correspondendo a 26% das 516 entrevistadas e a 6% dos 142 homens que participaram. As respostas foram obtidas no primeiro semestre de 2013 e analisadas por quatro pesquisadoras da Universidade de Illinois. A pesquisa destacou também que cerca de 90% dos relatos de ataques foram feitos por estagiários de graduação, pós-graduandos e pós-doutorandos. Além disso, cerca de 64% dos entrevistados afirmaram terem passado por assédios sexuais, principalmente por meio de manifestações verbais constrangedoras. Leia mais (07/21/2014 - 12h03)


"Alive Inside" Shows How Music Can Break Through the Fog of Dementia

Fri, 18 Jul 2014 20:54:00 GMT

A documentary captures people with dementia reconnecting to emotions and lost memories through music

-- Read more on ScientificAmerican.com


Remembrances of AIDS and HIV Workers Killed in Shot-Down Plane

Fri, 18 Jul 2014 18:00:00 GMT

HIV health workers, a WHO staffer and at least one top AIDS researcher were among those killed when a Malaysia Airlines plane was shot down over Ukraine

-- Read more on ScientificAmerican.com


Every full moon, Landsat looks to the moon

Sun, 13 Jul 2014 15:59:40 EDT

Every full moon, Landsat 8 turns its back on Earth. As the satellite's orbit takes it to the nighttime side of the planet, Landsat 8 pivots to point at the moon. It scans the distant lunar surface multiple times, then flips back around to continue its task of collecting land-cover information of the sunny side of Earth below.


Out of an hours-long explosion, a stand-in for the first stars

Fri, 11 Jul 2014 15:33:41 EDT

Astronomers analyzing a long-lasting blast of high-energy light observed in 2013 report finding features strikingly similar to those expected from an explosion from the universe's earliest stars. If this interpretation is correct, the outburst validates ideas about a recently identified class of gamma-ray burst and serves as a stand-in for what future observatories may see as the last acts of the first stars.