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כתבות אחרונות מאתר 'Phys'
Phys

The coldest 'stars' in the galaxy might actually be alien megastructures‎

Ever since physicist Freeman Dyson first proposed the concept in 1960, the "Dyson sphere" has been the holy grail of techno-signature hunters. A highly advanced civilization could build a "sphere" (or, in our more modern understanding, a "swarm" of smaller components) around their host star to harvest its entire energy output. We know, in theory at least, that such a swarm could exist—but what would it actually look like if we were able to observe one? A new paper, available on the arXiv pre-print server and soon to be published in Universe from Amirnezam Amiri of the University of Arkansas, digs into that question—and in the process discloses the types of stars that are the most likely to find them around.

19:02
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Phys

Mixed-flower Australian honey packs a stronger anti-microbial punch‎

Honeybees collecting nectar from a "buffet" of Australian native plants made honey with anti-microbial abilities that is more potent than "single origin" honey made from only one source of plant or flower, a University of Sydney-led study has found. The findings could help develop new treatments for drug-resistant infections while supporting bushfire recovery and sustainable beekeeping practices across Australia. They also place native Australian honey as a strong competitor on the global landscape.

19:02
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Phys

Scientists develop new model to accurately assess global salt marsh carbon sinks‎

A research team from the Institute of Atmospheric Physics, Chinese Academy of Sciences, has developed an innovative model to accurately assess the carbon sequestration capacity of global salt marshes, addressing a long-standing gap in blue carbon accounting.

17:31
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Phys

V615 Vul shows rare hybrid nova signature after rapid two-day rise‎

Italian astronomers have performed extensive spectroscopic monitoring of a recently discovered nova known as Vulpeculae 2024, also known as V615 Vul. Results of the new observations, presented in a paper published in the Astronomy & Astrophysics journal, shed more light on the nature of Vulpeculae 2024, suggesting that it represents a rare class of hybrid novae.

17:31
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Phys

Saturday Citations: More bad news for US footballers; ancient Mayan water management; investigative LLMs‎

What we learned this week: Left-handed people may have a psychological edge in competition. Humanoid robots can now do creepy parkour through the uncanny valley. And if you've ever cared for an elderly cat, a new study highlights a biological quirk that could explain why they're so prone to kidney disease.

16:00
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Phys

A new clue to how the body detects physical force‎

Every time we feel a gentle tap on the skin, specialized nerve cells convert that physical force into an electrical signal the brain can interpret as touch. While scientists have long known that a protein called PIEZO2 acts as a key sensor for touch, it remained unclear why PIEZO2 is specialized for the localized mechanical forces experienced by sensory neurons, whereas its close relative PIEZO1 responds to broader mechanical stresses such as those generated when cells stretch, as occurs in blood vessels.

16:00
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Phys

Study reveals new technique to identify individual night-flying birds for the first time‎

Millions of birds invisibly migrate through the night sky each autumn, most flying in near silence toward their wintering grounds. Now, scientists have developed a way to see and identify many of those birds for the first time.

16:00
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Phys

NASA's DART test for planetary defense proved it can shift an asteroid's solar orbit‎

Four years ago, NASA purposely smashed a spacecraft into a small asteroid to see if they could deflect it—a test to prove humanity could protect Earth from threatening space rocks.

14:29
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Phys

Analysis of 1,000 Tinder profiles reveals nine standard pose types‎

Choosing a Tinder profile picture may feel like a free, personal and creative act. But how true is that? A new study from the Universitat Oberta de Catalunya (UOC) shows that, far from being unique, most users follow one of a small number of visual strategies. The research, led by Alejandro García Alamán, a member of the CIRCLE Lab and instructor at the Faculty of Psychology and Education Sciences, identifies nine standardized profile types that recur systematically on these platforms.

14:29
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