среда, 31 июля 2013 г.

UN investigating three cases of use of chemical weapons in Syria

UN experts are investigating three cases of alleged use of chemical weapons in Syria, the official representative of the organization, Martin Nesirky.

"The mission will go to Syria in the near future for the simultaneous investigation of the three cases that have been reported, including the Khan al-Asal," - said in a statement.

Invitation of the Government of Syria led by a group of Swedish experts Professor Åke Selstrom.

To resolve this issue last week Selstrom and High Representative of the UN Secretary-General for Disarmament Affairs Angela Kane visited Damascus.




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вторник, 30 июля 2013 г.

First time scientists have considered an exoplanet in X-rays

Scientists from the United States was the first to consider located outside the solar system planet in X-rays.

Until now, similar observations were made solely in the optical domain, but the Chandra telescope and the European XMM Newton telescope has allowed astronomers to make the next step in the study of extrasolar planets.

"Thousands of candidate planets were discovered through transits in visible light. Fact that we were finally able to see one in X-rays, it is important because it gives new information about the properties of exoplanets," - said Kate Poppenheger of the Harvard-Smithsonian Center for Astrophysics.

Scientists monitored the hot Jupiter HD 189733b - Opened in 2005, the gas giant, which is 1.14 times larger than Jupiter, and almost as many times heavier than him. It orbits the star HD 189733 A, whose size and weight is approximately 80% of the sun.

In this case, the fall of the star's brightness in X-rays proved stronger than in the visible range. In optics brightness dropped by 2.4%, the Chandra and XMM Newton X-ray brightness recorded a decline of 6% -8%.
"We interpret this as a result of the impact of the outer atmosphere of the planet, which is transparent to visible light, but dense enough to hold up X-rays" - the scientists conclude.

As previously reported, the company soon Orbital Sciences Corporation for NASA to build a telescope-hunter exoplanets TESS. Probe TESS (Transiting Exoplanet Survey Satellite) will look for planets outside our solar system transit method - fixing small oscillations of the brightness of stars associated with the passage of the planet on the background brightness of the disk. The main task will be to find extrasolar planets TESS potentially suitable for the existence of life, the nearest stars.




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Scientists have reviewed the causes of man’s transition to monogamy

Ancient people have formed a family to protect the offspring from aggression by other men, who thus wanted to "liberate" women from having to take care of children conceived competitors.

This is the conclusion drawn by researchers from University College London.

A team of researchers led by Christopher Opie studied device families and flocks in 230 primate species that exist today. In particular, they were interested in the relationship between males and females, number of calves, their mortality, and other parameters related to demography.

The construction of a 'family tree' for all primates has allowed anthropologists to identify the most primitive forms of the family unit and to understand why they gave way to the traditional family.

As it turned out, more monogamy was caused by three factors: the care of the offspring, the nature of migration and female infanticide.

The calculations showed that the most likely cause of monogamy was the need to protect the offspring from the "attention" of other males, and not taking care of the offspring, as some anthropologists.

According to biologists, similar mechanisms might be involved in the transition of some birds and hoofed animals to live in pairs.




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