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כתבות אחרונות מאתר 'Phys'
Phys

An island of calm at the violent heart of the galaxy‎

Where would you go to watch a star being born? Probably not the heart of the Milky Way, which is about the most violent neighborhood our galaxy has to offer, a maelstrom of gas churning so fast and so chaotically that you would think nothing could ever settle there long enough to collapse into a star. And yet stars do form in that turmoil, and astronomers have just begun to work out how by finding an unexpected pocket of calm in the chaos.

00:47
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Phys

Rats show empathy, according to model‎

A rat first frees a cagemate rat and then shares food with it. Is this animal just as empathetic as humans? In an American study from 2011, researchers observed that rats first freed their fellow rats from a cage and then shared food with them instead of leaving them in the cage and eating alone; this means they showed empathy. But do they have the same capacity for empathy as we humans, or do we differ in that regard?

23:12
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Phys

Spring songbirds may help pollinate UK trees, with pollen on 89% of studied birds‎

The warblers—those harbingers of spring in the U.K.—have an unappreciated talent of a different sort. Common U.K. birds, including chiffchaffs and blackcaps, are playing a real role in the pollination of plants, according to new research in the Journal of Ecology.

23:12
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Phys

Deuterium in comets tells interesting tales‎

Comets have played an interesting role in the history of astronomy. Since antiquity, many cultures saw them as omens or spirits, portending good or bad news for kings, queens and emperors. Over the past few hundred years, however, astronomers have studied them intently to understand the science behind these visitors to the inner solar system. Today, we know that these ghostly apparitions in the sky are dirty balls of ice and rock blasting through space, scattering dust and gases as they go.

21:56
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Phys

European cities short on shade as heat waves hit, urban mapping reveals‎

More than four in five homes and workplaces across 25 European cities have less nearby tree canopy than what is needed for meaningful cooling, according to an open-data analysis by an urban greening expert.

20:11
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Phys

Mars express captures dozens of dust devils in Mars valley‎

Dust devils are a regular feature on Mars. Just like those found on Earth, these mini whirlwinds form when parts of Mars are warmed by the sun, causing air above the surface to swirl upward and carry dust with it. But in Mars' lower gravity (38% that of Earth), these devils grow much larger, reaching up to 8 km (5 miles) in height and speeds of up to 45 meters per second (150 feet per second). They are also a major part of Mars' meteorological cycles, playing a key role in distributing dust across the planet.

20:11
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Phys

A nearby black hole as a window into the early universe‎

An international team led by Stefanie Komossa from the Max Planck Institute for Radio Astronomy (MPIfR) in Bonn has studied a galaxy that has been shining exceptionally brightly in the radio regime for more than eight years. Although it is only 1.8 billion light-years away from us, the central black hole in the galaxy exhibits properties typical of the early universe. New observations and archival data suggest that, for several years now, more matter has been falling into the black hole, triggering a high-energy particle jet. The discovery enables researchers to better understand the formation of jets and the growth of black holes in the early universe.

19:16
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Phys

Laughter may date back 15 million years, shared by humans and great apes‎

Humans and great apes have been giggling in similar ways since branching off the evolutionary tree, a new study suggests.

18:29
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Phys

Japan space probe skims asteroid in test for planetary defense‎

A Japanese space probe performed a flyby of a near-Earth asteroid on Sunday in a test mission for technology that could help protect the planet from space rocks.

17:32
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Phys

Scattered bronze bells in Chinese lord's 2,600-year-old tomb point to ritual deactivation‎

When archaeologists opened the 2,600-year-old tomb of an ancient Chinese lord, they discovered his magnificent bronze bells had been scattered, their wooden hangings broken. But the most mysterious part of all: This was apparently no accident, with the family of the tomb's owner having chosen to "deactivate" the bells when their powers were no longer needed.

17:32
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