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Richardket

18 Aug 2024 - 04:30 pm

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 - 09:04 am

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18 Aug 2024 - 08:48 am

ISIS-inspired suspect planned suicide attack at Taylor Swift concert, Austrian authorities say
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Police in Austria have questioned three teenagers suspected of plotting a suicide attack at a Taylor Swift show, sparking renewed concerns over the indoctrination of young people online.

Foreign intelligence agencies helped authorities uncover the alleged scheme, according to the country’s Interior Minister Gerhard Karner. A source familiar told CNN that the US issued a warning to authorities in Vienna.

Organizers canceled three concerts, which were scheduled to take place in the European capital from Thursday to Saturday. CNN has reached out to Swift’s representatives for comment.

Investigators unearthed a stockpile of chemicals, explosive devices, detonators and 21,000 euros in counterfeit cash at the home of the main suspect, a 19-year-old ISIS sympathizer who had been radicalized online, according to authorities.
The young man – who was arrested Wednesday morning in the eastern town of Ternitz – planned to kill himself and “a large number of people,” according to the head of the domestic intelligence agency, Omar Haijawi-Pirchner.

“He said he intended to carry out an attack using explosives and knives,” Haijawi-Pirchner told reporters in Vienna on Thursday. “His aim was to kill himself and a large number of people during the concert, either today or tomorrow.”

Two other suspects were detained, aged 17 and 15. The 17-year-old worked for a facilities company that would have provided services at the concert venue. He was near the stadium when he was arrested and had recently broken up with his girlfriend, according to Haijwai-Pirchner.

Little has been revealed about the 15-year-old. Prosecutors will decide later if he was a witness or directly involved in the alleged plot.

The three are all Austrian-born with either Turkish, North Macedonian or Croatian backgrounds.