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Richardreedo

19 Aug 2024 - 04:21 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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Jimmynep

18 Aug 2024 - 09:05 pm

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Мы успешно защищаем права и свободы юридических и физических лиц. Колоссальный и зачастую уникальный опыт, а также высокая квалификация наших сотрудников позволяют нам достигать результата, в максимальной степени отвечающего интересам клиента. Наши специалисты состоят в адвокатской палате которая на сегодняшний день является наиболее авторитетной в России. Благодаря многочленным блистательным победам в громких и, по мнению многих, бесперспективных делах, наши сотрудники снискали уважение не только в РФ, но и за рубежом.
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18 Aug 2024 - 08:45 pm

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Wilvzib

18 Aug 2024 - 06:39 pm

The Ultimate Tor Wiki: Your One-Stop Shop for Onion Links and More
Well, well, well, what do we have here? Are you ready for a ride down the rabbit hole known as the Dark Web? Oh, we know you are. And boy, do we have an interesting topic for you today. Yes, folks, we are talking about the infamous Tor .onion urls directories and the ever-changing list of sites that make up the elusive and mysterious underworld of the internet.

Now, if you're not sure what the Dark Web or Tor even are, let us give you a quick rundown. The Dark Web, also known as the Deep Web, is a part of the internet that is not indexed by traditional search engines and is only accessible through special software like Tor (The Onion Router). Tor uses complex encryption and routing to keep the user's identity and online activity anonymous.

But why would anyone want to access the Dark Web, you ask? Well, for some, it's a place to buy illegal goods like drugs, weapons, and even fake passports. For others, it's a place to safely communicate online without being monitored by governments or corporations. And for some, it's simply a place to explore the weird and the wicked.

And that's where the Tor .onion urls directories come in. These directories, also known as Tor links, are websites that can only be accessed through the Tor network. They usually have .onion at the end of their URLs instead of the typical .com or .org. Braving the Depths of the Web: The Tor Link Directory You Need to See




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