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MessagePosté le: Sam 22 Sep - 05:47 (2018)    Sujet du message: Répondre en citant

WASHINGTON , May 12 (Xinhua) -- Mysterious dark material on the surface of Jupiter's moon Europa is likely sea salt from a subsurface ocean, darkened by exposure to radiation, researchers from the U.S. space agency NASA suggested Tuesday.

For more than a decade, scientists have wondered about the nature of the dark material that coats long, linear fractures and other relatively young geological features on Europa's surface.

Its association with young terrains suggests the material has erupted from within Europa, but with limited data available , the material's chemical composition has remained elusive.

To identify the dark material, researchers at NASA's Jet Propulsion Laboratory created a lab setup that mimics conditions on Europa's surface in terms of temperature, pressure and radiation exposure.

For this study, the researchers tested samples of common salt -- sodium chloride -- along with mixtures of salt and water, in their vacuum chamber in accordance with Europa's chilly surface temperature of minus 280 degrees Fahrenheit (minus 173 degrees Celsius).

They then bombarded the salty samples with an electron beam to simulate the intense radiation on the moon's surface.

After several days of exposure to this harsh environment, which corresponds to as long as a century on Europa , the salt samples' color turned from white to yellowish-brown, which is similar to features on the icy moon.

Additionally, the longer the samples were exposed to radiation, the darker the resulting color, they found.

"The presence of sea salt on Europa's surface suggests the ocean is interacting with its rocky seafloor -- an important consideration in determining whether the icy moon could support life," NASA said in a statement.

The study was published online in the U.S. journal Geophysical Research Letters.
WASHINGTON , April 18 (Xinhua) -- Vermont Senator Bernie Sanders is the United States' most popular active politician, viewed favorably by 57 percent of registered voters, according to a new poll.

Sanders is particularly popular aged 18 to 34, who gave him a 62 percent approval rating. He also has majority support among those over the age of 50, according to the latest Harvard-Harris survey.

Moreover, he is the only person among 16 Trump administration officials or congressional leaders included in the survey that is viewed favorably by a majority of voters.

In contrast , only 16 percent think favorably of White House chief strategist Stephen Bannon, while 45 percent of voters have a negative view of him, according to the survey data obtained by theHill news group exclusively on Tuesday.

""In losing to Hillary (Clinton), Bernie Sanders has floated above today's partisan politics while Bannon has, rightly or wrongly, taken the blame for the administration's failures ,"" said Harvard-Harris co-director Mark Penn.

""It is symptomatic of the Democrats increasingly consolidating to the left while the Republicans are fractured and unable to come together. Sanders is an asset to the Democrats while Bannon is a liability to the administration,"" Penn said.

Clinton is at 42 percent positive and 53 percent negative, down from a 44-51 split in a Harvard-Harris poll in February.

House Minority Leader Nancy Pelosi is viewed favorably by 31 percent of registered voters and unfavorably by 48 percent, while Senate Democratic Leader Charles Schumer is at 27 percent positive and 35 percent negative, the poll finds.

On the Republican side, President Donald Trump's favorability rating is at 44 percent positive and 51 negative. House Speaker Paul Ryan is viewed favorably by 34 percent of voters and unfavorably by 47 percent. Senate Majority Leader Mitch McConnell fares worse , at 23 percent positive and 42 percent negative.

FBI Director James Comey is also deep in negative territory in the poll, at 18 percent positive and 36 percent negative.

The online survey of 2,027 registered voters was conducted between Friday and Monday based on a methodology that doesn't produce a traditional margin of error.

The Harvard-Harris survey is a collaboration of the Harvard Center for American Political Studies and The Harris Poll.

China reshuffles 84 corps-level military units

China hopes for a united, stable and prosperous EU: Premier Li

China, Vietnam start joint fishery inspection in Beibu Gulf

British PM calls snap general election on June 8

In pics: scenery of Baiyangdian in Xiongan New Area

In pics: tea garden in central China's Henan

Peach blossoms on terrace fields in Guyuan, NW China's Ningxia

Stewardesses for high-speed train take part in training program in Harbin
" A scene from Tea Pets [PhotoMtime]
A 3D-animation centered around tea pets , cute clay figurines in a local tea shop in a southern Chinese city, will hit theaters around China this Friday.

The lead character, a clay figurine named Ah Tang, is different from all the other cute little clay figures which change color when covered in tea. This makes Ah Tang upset.

It is also the motivation behind his action-packed adventures to realize his desire to change color like the other figures that are believed good-luck charms for tea drinkers.

Chinese actress Hu Ke and her son sang the theme song for this movie.

"I really appreciate the delicately-designed story plot. This animation conveys the knowledge of traditional Chinese culture, including theories about life that they need to consider. The movie not only entertains kids but also educates them."

Earlier, Tea Pets was nominated in the competition for Golden Goblet Award for best animation in Shanghai , along side four other animations.
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