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Astronomers have traditionally relied on helioseismology to estimate the Sun’s age by analysing the vibrations that ripple through its interior. However, recent research has uncovered a significant obstacle, the Sun’s magnetic activity, which follows an 11-year cycle, appears to be distorting these measurements. Data from the Birmingham Solar Oscillations Network (BISON) and NASA’s SOHO mission, which spans over 26.5 years, revealed a 6.5 percent difference in the Sun’s age when measured at the solar minimum compared to the solar maximum.

This discrepancy, attributed to variations in the Sun’s magnetic activity, suggests that similar methods used to measure the age of other stars might also be affected, particularly those with more intense magnetic fields.

How Magnetic Activity Alters Solar Age Perceptions

The Sun’s magnetic activity, which alternates between solar minimum and maximum, is more influential than previously thought, according to a research paper published in the Astronomy & Astrophysics journal. During periods of high magnetic activity, the oscillations within the Sun—detected by instruments like BISON and GOLF (Global Oscillations at Low Frequency)—produce results that indicate a younger Sun than during times of low magnetic activity.

These oscillations, caused by internal waves within the Sun, change the luminosity and surface movements, allowing scientists to infer details about the Sun’s internal structure and, theoretically, its age. However, the unexpected influence of magnetic activity on these measurements challenges the long-held assumption that such activity should have little impact on helioseismology.

Challenges for Future Stellar Observations

The implications of this discovery extend beyond our Sun. As scientists prepare for the European Space Agency’s upcoming PLATO mission, which is set to launch in 2026, they must now consider the impact of magnetic activity when measuring the age, mass, and radius of distant stars. PLATO aims to detect dips in starlight caused by both transiting exoplanets and asteroseismic oscillations, similar to those observed in the Sun.

If magnetic activity significantly alters these measurements, as seen with the Sun, it could necessitate a reevaluation of past data from missions like NASA’s Kepler Space Telescope. This revelation poses a “looming challenge” for the future of asteroseismology, requiring new methods to ensure accurate measurements of stellar ages, especially for more magnetically active stars.
 

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Catch the Beaver Moon on Nov 15, 2024 – the year’s last supermoon!

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November 14, 2024

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Catch the Beaver Moon on Nov 15, 2024 - the year's last supermoon!

The final supermoon of 2024, known as the Beaver Moon, will make its appearance on Friday, November 15. This full moon, which will reach its peak illumination at 4:29 PM EST, is anticipated by lunar enthusiasts as it marks the last supermoon event of the year. Visible as dawn approaches in Jakarta, this celestial event follows October’s Hunter’s Moon and concludes a sequence of four consecutive supermoons observed throughout 2024, according to NASA.

What is the Beaver Moon?

November’s full moon is traditionally called the Beaver Moon, a term that originates from Native American customs and was popularised by the Maine Farmer’s Almanac. This name is linked to the seasonal timing when beavers prepare their dens for winter or were historically hunted to ensure a supply of warm furs. In various regions, November’s full moon is also known as the Frost Moon or Snow Moon, reflecting the colder weather patterns typically seen in North America during this time.

When to See the Beaver Moon

The Beaver Moon will appear full to viewers for three days, from the early hours of 14 November to just before sunrise on November 17. This gives stargazers multiple opportunities to catch a glimpse of the bright, enlarged moon, which will be slightly closer to Earth than usual, enhancing its size and brightness compared to typical full moons. This phenomenon occurs when the moon reaches its closest orbital point, known as perigee, during a full phase, resulting in what is known as a supermoon.

Other Astronomical Highlights This Month

Apart from the Beaver Moon, November brings other notable astronomical events. On 16 November, Mercury will reach its greatest eastern elongation, making it ideal for evening observation. Additionally, the Leonid meteor shower is expected to peak from November 17 to 18, providing another highlight for skywatchers. Uranus will also be visible, reaching its closest point to Earth on November 17, according to Seasky.org, giving viewers a brighter and more accessible sighting.

For those interested in astronomy, November 15 offers a special chance to observe this year’s last supermoon before the seasonal Cold Moon arrives in December.

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Scientists Discover New Electric Field in Earth’s Atmosphere

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November 14, 2024

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Scientists Discover New Electric Field in Earth’s Atmosphere

A faint electric field has been detected in Earth’s atmosphere, confirming a theory that scientists have held for decades. This ambipolar electric field, though weak at just 0.55 volts, could play a vital role in shaping Earth’s atmospheric evolution and its ability to support life, according to recent findings. Glyn Collinson, an atmospheric scientist at NASA’s Goddard Space Flight Center, led the Endurance rocket mission, which successfully measured this field in May 2022 above Svalbard, Norway. Collinson has described this field as a “planetary-energy field” that had eluded scientific measurement until now.

How the Ambipolar Field Affects Earth’s Atmosphere

The presence of this field is thought to explain a phenomenon observed decades ago—the polar wind. When sunlight strikes atoms in the upper atmosphere, it can cause negatively charged electrons to break free and drift into space, while the heavier, positively charged oxygen ions remain. To maintain an electrically neutral atmosphere, a faint electric field forms, tying these particles together and preventing electrons from escaping. This weak field has been shown to provide energy to lighter ions, such as hydrogen, enabling them to break free from Earth’s gravity and contribute to the polar wind.

This ambipolar electric field could have implications for planetary habitability. David Brain, a planetary scientist at the University of Colorado Boulder, noted that understanding how such fields vary across planets could shed light on why Earth has remained habitable compared to planets like Mars and Venus. Although both Mars and Venus have electric fields, the absence of a global magnetic field on those planets allowed more of their atmospheres to escape into space, potentially altering their climates significantly.

Further Research Planned

NASA has recently approved a follow-up mission with a rocket named Resolute, expected to launch soon. Collinson believes that continued investigation into planetary electric fields may help answer fundamental questions about why Earth supports life while other planets do not.

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Amber Found in Antarctica for the First Time

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November 14, 2024

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Amber Found in Antarctica for the First Time

The discovery of amber in Antarctica has been reported for the first time, as detailed in a recent study published in Antarctic Science. Dr. Johann Klages from the University of Bremen, alongside a team of researchers, uncovered this specimen in sediment cores from the Pine Island trough in West Antarctica. This ancient amber, originating from approximately 83 to 92 million years ago during the mid-Cretaceous period, offers valuable insights into prehistoric environmental conditions near the South Pole.

Unveiling the First Antarctic Amber

The study was published in Antarctic Science journal and reveals that the amber, known as Pine Island amber, was retrieved using the MARUM-MeBo70 drill rig during a 2017 expedition on the RV Polarstern vessel. This mid-Cretaceous resin is considered a significant breakthrough as it suggests that a swampy temperate rainforest, dominated by coniferous trees, thrived in the region during a much warmer period in Earth’s history. According to Dr. Henny Gerschel from the Saxon State Office for the Environment, Agriculture and Geology, the amber likely contains tiny fragments of tree bark, preserved through micro-inclusions. Its solid, translucent quality indicates that it was buried close to the surface, protecting it from thermal degradation.

Insights into Prehistoric Forest Ecosystems

The presence of pathological resin flow within the amber offers clues into the defence mechanisms used by ancient trees against environmental stressors like parasites or wildfires. “This discovery hints at a much richer forest ecosystem near the South Pole during the mid-Cretaceous,” Dr. Klages explained, noting the resin’s defensive chemical and physical properties that protected it from insect attacks and infections.

Reconstructing Ancient Antarctic Environments

The amber’s discovery marks a key step in reconstructing ancient polar climates, supporting the idea that temperate forests once spanned across all continents. Researchers aim to explore further by analysing whether signs of past life are preserved in the amber. This study, beyond unearthing Antarctic amber, opens new opportunities to deepen understanding of Earth’s climatic past and the adaptability of prehistoric ecosystems.

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