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כתבות אחרונות מאתר 'Phys'
Phys

Urban expansion causes ecological collapse in streams in the São Paulo Metropolitan Area‎

The advance of urbanization in the São Paulo Metropolitan Area in Brazil is causing the collapse of food webs in local streams. A study published in August in the journal Nature Cities reveals that the impact of the metropolis goes far beyond a simple reduction in species. Degradation selectively eliminates organisms based on their size and simplifies ecological interactions. Networks of 190 connections plummet to just three.

00:01
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Phys

A dead star is flashing radio waves every 8 minutes, and its partner looks a lot like the sun‎

Since 2022, astronomers have been puzzling over a new kind of cosmic object called long-period radio transients. These are objects that emit bright flashes of radio waves into space every few minutes to every few hours. Some have been traced back to binary systems consisting of a small, dim, cool star called a red dwarf in orbit with a stellar remnant called a white dwarf.

00:01
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Phys

Does your culture shape how you look at art? What an eye‑tracking study in Sudan revealed‎

Today, Old Dongola is an abandoned settlement on the banks of the Nile in northern Sudan. Hundreds of years ago, however, this place looked very different.

22:30
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Phys

NASA's Voyager 1 closes in on a light-day in interstellar space for a new distance record‎

NASA's Voyager 1 is about to become humanity's first object to reach one light-day from Earth as it pushes ever deeper into interstellar space.

20:59
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Phys

A cosmic magnifying glass could reveal the same supernova two more times in roughly 70 years‎

Thanks to the gravitational lensing caused by a massive galaxy cluster and high-resolution images from the James Webb Space Telescope (JWST), astronomers discovered an exploding star when the universe was 4.9 billion years old. The discovery paper, posted to the arXiv preprint server on Oct. 23, presents a prediction for when the rest of the distorted images of SN Ares will arrive.

20:59
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Phys

Some of the oldest rocks ever discovered shed light on Earth's early history‎

Earth is approximately 4.5 billion years old, according to estimates. However, rocks dating back to the planet's earliest days are extremely rare. Hence the excitement over the discovery in northern China of some of the oldest known rocks on Earth, dating back 3.95 billion years. And one of the reasons for all the attention is that they're revealing new clues about how Earth's crust formed and evolved.

19:28
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Phys

World's largest freshwater lake is recovering after decades of decline‎

Lake Baikal in Siberia holds around 20% of the world's surface freshwater, making it the most voluminous freshwater lake (Lake Superior on the United States–Canada border is the largest by surface area). This makes the lake one of the most important environments for biodiversity—in fact, it was designated a UNESCO World Heritage site in 1996 because of this. Yet it has shown considerable decline over the last century, with aridification spreading across East Asia.

17:57
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