Connect with us

Published

3 months ago

on

Astronomers have achieved a significant breakthrough with new high-resolution images of Polaris, also known as the North Star. Using the CHARA Array located on Mount Wilson in California, researchers have captured unprecedented details of the star’s surface. This is the first time scientists have been able to observe features such as large bright and dark spots on Polaris, similar to sunspots on our Sun. The advanced imaging technique employed by CHARA, which combines the light from six telescopes to create a single, highly detailed picture, has revealed these surprising features.

New Insights into Polaris’ Surface

The high-resolution images obtained from the CHARA Array have shown that Polaris, a Cepheid variable star, has noticeable surface spots. These spots, which fluctuate in brightness, were not previously detected. According to Dr Gail Schaefer, Director of the CHARA Array, “The CHARA images revealed large bright and dark spots on the surface of Polaris that changed over time.” This discovery is intriguing as Polaris’ variable brightness occurs in a predictable four-day cycle, making it valuable for cosmic distance measurements.

Polaris: A Star in a Triple System

Polaris, which is part of a triple-star system, has been observed to have a companion star that orbits it every 30 years. The challenge of resolving this faint companion, which was first documented by the Hubble Space Telescope in 2005, has been met with innovative techniques. Dr Nancy Evans from the Center for Astrophysics at Harvard & Smithsonian noted that the team used a speckle interferometer from the Apache Point Observatory to aid their observations. The recent study also confirmed that Polaris may be about five times more massive than the Sun, adding further interest to its detailed study.

Future Research Directions

The findings from the CHARA Array’s high-resolution imaging of Polaris provide a new perspective on Cepheid variable stars. The team, including John Monnier from the University of Michigan, plans to continue their observations to better understand the mechanisms behind the surface spots and their impact on the star’s behaviour. The results open up new questions about the star’s rotation and luminosity, which will be explored in future studies.

These groundbreaking observations mark a significant step forward in our understanding of Polaris and Cepheid variables, offering new insights into stellar dynamics and the nature of our North Star.

Related Topics:
Continue Reading

Science

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

Published

12 hours ago

on

November 14, 2024

By

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.

For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who’sThat360 on Instagram and YouTube.


Kanguva OTT Release Date Reportedly Revealed: Here’s Everything You Need to Know



Vivo Y300 5G India Launch Date Announced; Rear Design, Colours Revealed

Continue Reading

Science

Scientists Discover New Electric Field in Earth’s Atmosphere

Published

12 hours ago

on

November 14, 2024

By

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.

For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who’sThat360 on Instagram and YouTube.


Dying Light 2, Like a Dragon: Ishin!, GTA 5 and More Join PS Plus Game Catalog in November



The Rana Daggubati Show to Premiere on Prime Video on November 23

Continue Reading

Science

Amber Found in Antarctica for the First Time

Published

13 hours ago

on

November 14, 2024

By

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.

Continue Reading

Trending