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MessagePosté le: Lun 23 Juil - 05:51 (2018)    Sujet du message: Répondre en citant

LOS ANGELES Nike Air Vapormax Flyknit Australia , Jan. 31 (Xinhua) -- The existence of large numbers of molecules in winds powered by supermassive black holes at the centers of galaxies has puzzled astronomers more than a decade. New theory predicts that molecules in black hole winds are not survivors of the heat of the energetic outflows at all, but brand-new molecules.

Molecules trace the coldest parts of space, and black holes are the most energetic phenomena in the universe, so finding molecules in black hole winds was like discovering ice in a furnace.

Researchers in Northwestern University's Center for Interdisciplinary Research and Exploration in Astrophysics (CIERA) predict that these molecules are born in the winds with unique properties that enable them to adapt to and thrive in the hostile environment.

The theory, published in the current issue of Monthly Notices of the Royal Astronomical Society Nike Air Vapormax Australia , is the work of Lindheimer post-doctoral fellow Alexander Richings, who developed the computer code that, for the first time, modeled the detailed chemical processes that occur in interstellar gas accelerated by radiation emitted during the growth of supermassive black holes.

"When a black hole wind sweeps up gas from its host galaxy, the gas is heated to high temperatures Nike Air Max 2018 Mens Australia , which destroy any existing molecules," Richings was quoted as saying in a statement. "By modeling the molecular chemistry in computer simulations of black hole winds, we found that this swept-up gas can subsequently cool and form new molecules."

This theory answers questions raised by previous observations made with several cutting-edge astronomical observatories including the Herschel Space Observatory and the Atacama Large Millimeter Array, a powerful radio telescope located in Chile.

New stars form from molecular gas, so the new theory of molecule formation helps explain the formation of new stars in winds Nike Air Max 2018 Womens Australia , according to the new study.

"This is the first time that the molecule formation process has been simulated in full detail, and in our view, it is a very compelling explanation for the observation that molecules are ubiquitous in supermassive black hole winds, which has been one of the major outstanding problems in the field," said co-author Claude-Andre Faucher-Giguere , who studies galaxy formation and evolution as an assistant professor in Northwestern's Weinberg College of Arts and Sciences.

Compared to pre-existing molecules, researchers believe that the new molecules formed in the winds are warmer and brighter in infrared radiation.

The new theory will be put to the test when the U.S. National Aeronautics and Space Administration (NASA) launches the James Webb Space Telescope in spring 2019. If the theory is correct, the telescope will be able to map black hole outflows in detail using infrared radiation, researchers say.

SEOUL, Jan. 25 (Xinhua) -- A women ice hockey team of the Democratic People's Republic of Korea (DPRK) crossed the inter-Korean land border Thursday to South Korea for a joint training with their South Korean counterparts as the two sides agreed to field a unified team during the upcoming Winter Olympics.

The DPRK team Cheap Nike Air Max 2018 Australia , composed of 12 athletes, two supporting members and a coach, crossed the military demarcation line (MDL), which has divided the two sides since the 1950-53 Korean War ended in armistice, at about 9:20 a.m. local time (0020 GMT) Nike Air Max 2018 Shoes Australia , according to Seoul's unification ministry.
DPRK's women ice hockey team arrives in S. Korea for joint training DPRK's women ice hockey team arrives in S. Korea for joint training
The DPRK women's ice hockey team travelled by bus to the South Korean training center for athletes at Jincheon county in North Chungcheong province to start a joint training.

South Korea and the DPRK agreed to let their athletes march together under a unified flag at an opening ceremony of the upcoming Winter Olympics and field a joint women's ice hockey team, the first historically unified Olympic team between the two sides.

The 2018 Winter Olympic and Paralympic Games are slated to kick off on Feb. 9 at South Korea's eastern county of PyeongChang in Gangwon province.

Meanwhile, an advance team of the DPRK's athlete delegation travelled by land route to South Korea earlier in the day to check arenas and accommodations for athletes, cheerleaders and a demonstration team of Taekwondo Nike Air Max 2018 Australia , a traditional local martial art.

Seoul and Pyongyang agreed to cheer together for both athletes from the two sides, while the DPRK will send a Taekwondo demonstration team and a 140-member orchestra for concerts in capital Seoul and Gangneung, an east city near PyeongChang.

HAVANA, July 31 (Xinhua) -- Cuba on Monday rebuked U.S. sanctions against Venezuelan President Nicolas Maduro over an election in the Latin American country to choose members for the National Constituent Assembly, a body tasked to rewrite the constitution.

The sanctions against Maduro violate international law and are "totally arbitrary Men's Nike Air VaporMax Plus Triple White Australia ," the Cuban Foreign Ministry said in a statement issued late Monday.

Earlier, the Trump administration imposed a series of sanctions against the Venezuelan leader, accusing him and his government of undermining democracy in the South American country.

Measures put in place by the U.S. government include freezing any U.S. assets Maduro might have and banning people under U.S. jurisdiction from dealing with him.

These measures are part of a broader "international operation" which aims to topple Maduro and hand over the power to a "U.S. puppet opposition," the statement.

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