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18 Aug 2024 - 03:25 am

Johannes Kepler thought he sketched Mercury orbiting across the sun. What he actually captured has solved a solar mystery
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German astronomer Johannes Kepler made sketches of sunspots in 1607 from his observations of the sun’s surface — and centuries later, the pioneering drawings are helping scientists solve a solar mystery.

Even though everything in the solar system revolves around the sun, scientists have yet to unlock many of the star’s secrets.
However, studying the variability of the sun over time, including the solar cycle, could answer some of the most longstanding questions about the fiery orb and how it changes.
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Some of those questions revolve around solar activity in the 17th century, which was a pivotal time for studying the sun.

Astronomers observed sunspots with telescopes for the first time in 1610. At the same time, the sun was making an unusual transition into an extended period of weakened activity. And Kepler’s long disregarded sketches, overlooked because they were drawings rather than telescopic observations, could provide crucial historical insights.

A new study that recreates the circumstances during which Kepler made his drawings appeared on July 25 in The Astrophysical Journal Letters.

“Kepler contributed many historical benchmarks in astronomy and physics in the 17th century, leaving his legacy even in the space age,” said lead study author Hisashi Hayakawa, assistant professor at Nagoya University’s Institute for Space-Earth Environmental Research, in a statement.

“Here, we add to that by showing that Kepler’s sunspot records predate the existing telescopic sunspot records from 1610 by several years. His sunspot sketches serve as a testament to his scientific acumen and perseverance in the face of technological constraints.”

The sun’s tumultuous activity
The sun experiences an 11-year cycle of waxing and waning activity, known as the solar cycle. Currently, scientists believe that the sun is reaching or nearing solar maximum, the annual peak of its activity for the current solar cycle, called Solar Cycle 25.

Solar maximum is typically associated with an increase in the number of sunspots visible on the sun’s surface. These dark regions, some of which can reach the size of Earth or larger, are driven by the sun’s strong and constantly shifting magnetic fields.

Today, scientists track solar activity using data from ground and space-based observatories, magnetic maps of the solar surface, and ultraviolet observations of the sun’s outer atmosphere.

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18 Aug 2024 - 02:18 am

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Tor's Top Hidden Sites: Touring the Dark Web's Best Kept Secrets
The internet is a vast expanse with innumerable websites and pages, but not all of them are visible or accessible to everyone. The Dark Web, or Deep Web, is a portion of the internet that is hidden and can only be accessed through special software. One such software is Tor, which allows users to browse hidden websites through Tor .onion urls.

The Dark Web is often associated with illegal activities such as drug trade, human trafficking, and cybercrime. However, it is also home to many websites that provide valuable information and resources. The problem lies in finding these websites as they are not indexed by search engines. This is where Tor links and directories come in.

Tor links are websites that can only be accessed through Tor .onion urls. These urls are not accessible through regular browsers and require the use of Tor to access them. Onion Urls are another term used to refer to these websites. Tor links provide a gateway to hidden websites that may not be easily accessible through regular browsing.

Directories like the Hidden Wiki and Tor Link Directory provide a list of Tor sites that can be accessed through Tor links. These directories offer a collection of websites that may not be easily accessible through regular browsing. They provide a valuable resource for people looking to explore the Dark Web and access information that may not be available through regular browsing.

It is important to note that not all Tor sites are illegal or involved in illegal activities. Many websites on the Dark Web are legitimate and offer valuable information and Navigate the Depths of the Web: Tor Link Directories and More




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18 Aug 2024 - 01:30 am

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18 Aug 2024 - 12:36 am

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17 Aug 2024 - 11:46 pm

Inside a heat chamber
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Kreycik had almost everything on his side when he went running on that hot day: he was extremely fit, relatively young and was an experienced runner.

While some people are more vulnerable to heat than others, including the very old and young, no one is immune — not even the world’s top athletes. Many are expressing anxiety as temperatures are forecast to soar past 95 degrees this week in Paris, as the Olympic Games get underway.
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Scientists are still trying to unravel the many ways heat attacks the body. One way they do this is with environmental chambers: rooms where they can test human response to a huge range of temperature and humidity.

CNN visited one such chamber at the University of South Wales in the UK to experience how heat kills, but in a safe and controlled environment.

“We’ll warm you up and things will slowly start to unravel,” warned Damian Bailey, a physiology and biochemistry professor at the university. Bailey uses a plethora of instruments to track vital signs — heart rate, brain blood flow and skin temperature — while subjects are at rest or doing light exercise on a bike.

The room starts at a comfortable 73 degrees Fahrenheit but ramps up to 104. Then scientists hit their subjects with extreme humidity, shooting from a dry 20% to an oppressive 85%.

“That’s the killer,” Bailey said, “it’s the humidity you cannot acclimatize to.”

And that’s when things get tough.

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17 Aug 2024 - 10:08 pm

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17 Aug 2024 - 07:00 pm

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