Guestbook

Michaelturse

02 May 2025 - 01:16 pm

A job for the Webb space telescope
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“We got 53 candidates for anomalies that cannot be well explained, but can’t say that all of them are Dyson sphere candidates, because that’s not what we are specifically looking for,” said Gabriella Contardo, a postdoctoral research fellow at the International School for Advanced Studies in Trieste, Italy, who led the earlier study. She added that she plans to check the candidates against Suazo’s model to see how many tie into it.
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“You need to eliminate all other hypotheses and explanations before saying that they could be a Dyson sphere,” she added. “To do so you need to also rule out that it’s not some kind of debris disk, or some kind of planetary collision, and that also pushes the science forward in other fields of astronomy — so it’s a win-win.”

Both Contardo and Suazo agree that more research is needed on the data, and that ultimately they could turn to NASA’s James Webb Space Telescope for more information, as it is powerful enough to observe the candidate stars directly. However, because of the lengthy, competitive procedures that regulate use of the telescope, securing access might take some time.
If Dyson spheres really exist, what could they be used for? “If you picture ourselves having as much energy as the sun is providing every second, we could do unheard of things,” Suazo said. “We could do interstellar travel, maybe we could even move the entire solar system to our preferred location, if we wanted.”

But don’t hold your breath, because the technology and the raw materials required to build the hypothetical structures are far beyond humanity’s grasp.

“They are so big that everything we have on Earth would not be enough to build them,” Suazo added. “Freeman Dyson said that we should dismantle Jupiter — the whole planet (for the raw materials).”

That supercolossal scale probably means that Dyson spheres, if they exist at all, are very rare.

Harryhek

02 May 2025 - 12:03 pm

Broken spheres
Dyson died in 2020 before any of his spheres could be found — although they are just one of a dozen ideas that bear his name.
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“As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
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“Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

“However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

Josephrom

02 May 2025 - 10:46 am

Broken spheres
Dyson died in 2020 before any of his spheres could be found — although they are just one of a dozen ideas that bear his name.
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“As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
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“Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

“However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

Jasoncip

02 May 2025 - 07:28 am

download # **Free Subnet Scanner for Windows: Find Vulnerabilities and Customize Your Tool** ## **Introduction** Network security is a critical concern for IT professionals, and identifying vulnerabilities within a subnet is a fundamental step in securing an infrastructure. A **subnet scanner** is a powerful tool that helps detect live hosts, open ports, and potential security weaknesses in a network. For Windows users, finding a **free, customizable subnet scanner** that also identifies vulnerabilities can be challenging. This article explores a **free subnet scanner for Windows**, its capabilities, and how you can further develop it to suit your needs. ## **Why Use a Subnet Scanner?** A subnet scanner automates the process of discovering active devices, services, and security gaps within a network. Key benefits include: - **Network Discovery** – Quickly identifies all connected devices. - **Vulnerability Detection** – Scans for outdated services, open ports, and misconfigurations. - **Security Auditing** – Helps in penetration testing and compliance checks. - **Customization** – Open-source tools allow modifications for specific needs. ## **Top Free Subnet Scanner for Windows** Several free tools can scan subnets and detect vulnerabilities on Windows. One of the most reliable options is **Advanced IP Scanner** by Famatech. ### **Features of Advanced IP Scanner** - **Fast Network Scanning** – Detects all devices in a subnet. - **Port Scanning** – Identifies open ports and running services. - **Remote Access** – Supports RDP and SSH connections. - **Exportable Reports** – Saves scan results in CSV or HTML format. Another powerful open-source alternative is **Nmap (Network Mapper)**, which offers deep vulnerability scanning with scripting capabilities. ### **Using Nmap for Vulnerability Scanning** Nmap is a command-line tool but has a GUI version called **Zenmap** for Windows. Key features: - **Host Discovery** – Finds live hosts in a subnet. - **Service Detection** – Identifies running services and versions. - **Vulnerability Scripting** – Uses NSE (Nmap Scripting Engine) to detect flaws. - **Custom Scans** – Allows advanced filtering and reporting. ## **How to Develop Your Own Subnet Scanner** If you want to **build or modify** a subnet scanner, consider using Python with libraries like: - **Scapy** – For packet manipulation and network scanning. - **Socket** – For port scanning and service detection. - **Nmap-Python** – Integrates Nmap into Python scripts. ### **Example: Simple Subnet Scanner in Python** ```python import scapy.all as scapy def scan_subnet(ip_range): arp_request = scapy.ARP(pdst=ip_range) broadcast = scapy.Ether(dst="ff:ff:ff:ff:ff:ff") arp_request_broadcast = broadcast / arp_request answered = scapy.srp(arp_request_broadcast, timeout=1, verbose=False)] devices = for element in answered: devices.append("ip": element].psrc, "mac": element].hwsrc) return devices print(scan_subnet("192.168.1.1/24")) ``` This script detects live hosts in a subnet using ARP requests. ## **Conclusion** A **free subnet scanner for Windows** like **Advanced IP Scanner** or **Nmap** can efficiently detect vulnerabilities and improve network security. For developers, building a custom scanner using Python provides flexibility and deeper control. Whether you use an existing tool or develop your own, regular subnet scanning is essential for maintaining a secure network environment. Would you like recommendations for additional tools or deeper scripting examples? Let us know in the comments!

Andrewlurge

02 May 2025 - 06:51 am

Water and life
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Lightning is a dramatic display of electrical power, but it is also sporadic and unpredictable. Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life — a fact that has cast doubt on such theories in the past, Zare said.

Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life.

“Microdischarges between obviously charged water microdroplets make all the organic molecules observed previously in the Miller-Urey experiment,” Zare said. “We propose that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life.”

However, even with the new findings about microlightning, questions remain about life’s origins, he added. While some scientists support the notion of electrically charged beginnings for life’s earliest building blocks, an alternative abiogenesis hypothesis proposes that Earth’s first amino acids were cooked up around hydrothermal vents on the seafloor, produced by a combination of seawater, hydrogen-rich fluids and extreme pressure.
Yet another hypothesis suggests that organic molecules didn’t originate on Earth at all. Rather, they formed in space and were carried here by comets or fragments of asteroids, a process known as panspermia.

“We still don’t know the answer to this question,” Zare said. “But I think we’re closer to understanding something more about what could have happened.”

Though the details of life’s origins on Earth may never be fully explained, “this study provides another avenue for the formation of molecules crucial to the origin of life,” Williams said. “Water is a ubiquitous aspect of our world, giving rise to the moniker ‘Blue Marble’ to describe the Earth from space. Perhaps the falling of water, the most crucial element that sustains us, also played a greater role in the origin of life on Earth than we previously recognized.”

Jamesquoni

02 May 2025 - 05:37 am

Sea Freedom Fest став найкращим фестивалем цього літа! Cosmic Gate просто порвали танцпол своїми сетами, а Miss Monique подарувала незабутні емоції. Окремо хочеться відзначити сцену «Інь-Янь», де виступали Sasha Stuff і Prometey. Це місце мало свою унікальну атмосферу, яка доповнювала загальний вайб фестивалю. Особливо сподобалися зони відпочинку – зручні і стильні. Організатори постаралися зробити все на найвищому рівні.

Carlosquazy

01 May 2025 - 11:54 pm

Water and life
Eth Mixer
Lightning is a dramatic display of electrical power, but it is also sporadic and unpredictable. Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life — a fact that has cast doubt on such theories in the past, Zare said.

Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life.

“Microdischarges between obviously charged water microdroplets make all the organic molecules observed previously in the Miller-Urey experiment,” Zare said. “We propose that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life.”

However, even with the new findings about microlightning, questions remain about life’s origins, he added. While some scientists support the notion of electrically charged beginnings for life’s earliest building blocks, an alternative abiogenesis hypothesis proposes that Earth’s first amino acids were cooked up around hydrothermal vents on the seafloor, produced by a combination of seawater, hydrogen-rich fluids and extreme pressure.
Yet another hypothesis suggests that organic molecules didn’t originate on Earth at all. Rather, they formed in space and were carried here by comets or fragments of asteroids, a process known as panspermia.

“We still don’t know the answer to this question,” Zare said. “But I think we’re closer to understanding something more about what could have happened.”

Though the details of life’s origins on Earth may never be fully explained, “this study provides another avenue for the formation of molecules crucial to the origin of life,” Williams said. “Water is a ubiquitous aspect of our world, giving rise to the moniker ‘Blue Marble’ to describe the Earth from space. Perhaps the falling of water, the most crucial element that sustains us, also played a greater role in the origin of life on Earth than we previously recognized.”

Edisonpal

01 May 2025 - 06:45 pm

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Alexisusano

01 May 2025 - 05:44 pm

Какие необычные методы обучения используют сейчас в XXI веке, чтобы стимулировать интерес к образованию и улучшить результаты, и как они могут быть интегрированы в систему образования?

Ferry Corsten — танцпол единым ритмом! В фудкорте попробовал невероятную еду. Какие блюда запомнились?

Howardcouby

01 May 2025 - 04:50 pm

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