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During the Diwali festival on October 25, there will be a partial solar eclipse which will be visible from the city as well as from most parts of the country, astrophysicist Debi Prasad Duari said. The eastern metropolis, however, will be able to witness the partial solar eclipse, the second in 2022, for a very small duration, the celestial phenomenon will be better observed in the northern and western regions of the country, he said.

The eclipse will not be observed from northeastern India as the celestial phenomenon will be occurring after sunset in those regions, Duari said.

Apart from India, the October 25 partial cosmic affair will be visible from most parts of Europe, northern Africa, the Middle East, and parts of Asia, Duari elaborated.

“The partial solar eclipse will begin in Iceland at around 2:29 pm IST and will be seen at its maximum from Russia at 4:30 hours IST. It will end at around 6:32pm IST over the Arabian Sea,” he told PTI while sharing information on the celestial event.

“The eastern part of the country will see the partial eclipse only marginally, that also during the sunset. The northern and western part of the country is a better location to observe the partial eclipse with a better view and for a longer period of time.

“During the new moon (Amavasya) the Sun, Moon, and Earth almost come in a linear configuration, whereby from the Earth we can see the Moon without any sunlight falling on it. But at times, as on October 25, the Sun, Moon, and Earth will almost be on the same plane resulting in the moon appearing to cover the Sun partially for a period of time causing a partial solar eclipse,” he explained.

In and around the metropolis, the partial eclipse will begin at around 4:52pm, the maximum occurring at 5:01pm, and will cease to be seen at 5:03pm at the sunset, Duari said.

“Even at the maximum eclipse, only 4 percent of the lighted disc of the setting Sun will be covered by the Moon,” he said.

In the north Bengal town of Siliguri, the celestial phenomenon will be occurring between 4:41pm and 4:59pm and during the maximum eclipse (at around 4:56pm) about 8.91 percent of the Sun will be covered by the Moon’s disc, Duari stated.

“In New Delhi, it will commence at around 4:29pm and end with the sunset at 6:09pm with the maximum eclipse to occur at 5:42pm when the Sun will be obscured by the Moon by an amount of only 24.5 percent,” Duari said.

Jaisalmer in Rajasthan will experience the eclipse from 4:26pm to 6:09pm with the maximum at around 5:30pm. when the disc of the Sun will be obscured by 42.5 percent.

“In Mumbai, the eclipse will begin at 4:49pm with the maximum occurring at around 5:42pm. It will end at 6:09pm, when the Sun appears to go down the Arabian Sea at sunset. Here, the Sun’s disc will be covered by about 24.5 percent,” he added.

In southern and central India, the eclipse will be again observed just before sunset with Nagpur experiencing the eclipse from 4:49pm to 5:42pm. In Bengaluru, the eclipse will begin at 5:12pm, reaching its maximum at 5:49pm and ending at 5:55pm during the sunset. Chennai will have the eclipse during 5:14pm to 5:44pm, the astrophysicist said.

The next major solar eclipse to be visible from India will be an annular eclipse on May 21, 2031 when the annularity can be observed from a narrow patch of land in south India, he said.

Three years later, on March 20, 2034, the next total solar eclipse will be visible from India and the totality will be observed from the northernmost part of Kashmir.

On both occasions, the whole country will observe a partial eclipse of varying magnitude depending upon its geographical location, Duari said.

Another partial eclipse can be seen from the northern part of India on June 1, 2030.

Referring to the harm caused to the eyes by Sun’s rays during an eclipse, Duari cautioned the sky enthusiasts to take “extreme precaution” while observing it.

“Even if the degree of the partial eclipse is not appreciable in most of the country, extreme precaution has to be taken by everybody who wants to observe this cosmic event. The Sun’s rays can be very harmful for the eye and can become critical,” he said.


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NASA Satellite Detects Tree Leaf Changes as Early Volcano Eruption Warning Signal

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NASA Satellite Detects Tree Leaf Changes as Early Volcano Eruption Warning Signal

NASA scientists might soon be able to forecast volcanic eruptions by monitoring how trees respond from space. Now, in a new collaboration with the Smithsonian Institution, they have discovered that tree leaves grow lusher and greener when previously dormant volcanic carbon dioxide seeps up from the ground — an early warning that a cone of magma is pushing upwards. Now, using satellites such as Landsat 8 and data from the recent AVUELO mission, scientists think this biological response could be visible remotely, serving as an added layer of early warning for eruptions in high-risk areas that currently menace millions worldwide.

NASA Uses Tree Greening as Satellite Clue for Early Volcano Eruption Warnings in Remote Regions

As per the research by NASA’s Earth Science Division at Ames Research Centre, greening occurs when trees absorb volcanic carbon dioxide released as magma rises. These emissions precede sulfur dioxide and are harder to detect directly from orbit.

While carbon dioxide does not always appear obvious in satellite images, its downstream effects — enhanced vegetation, for example — can help reinforce existing volcanic early warning systems, notes volcanologist Florian Schwandner. It could be important because, as the U.S. Geological Survey says, the country is still one of the most volcanically active.

Globally, about 1,350 potentially active volcanoes exist, many in remote or hazardous locations. On-site gas measurement is costly and dangerous, prompting volcanologists like Robert Bogue and Nicole Guinn to explore tree-based proxies.

Guinn’s study of tree leaves around Sicily’s Mount Etna found a strong correlation between leaf colour and underground volcanic activity. Satellites such as Sentinel-2 and Terra have proven capable of capturing these subtle vegetative changes, particularly in forested volcanic areas.

To confirm this method, climate scientist Josh Fisher led NASA-Smithsonian teams in March 2025 to Panama and Costa Rica, collecting tree samples and measuring gas levels near active volcanoes. Fisher sees this interdisciplinary research as key to both volcano forecasting and understanding long-term tree response to atmospheric carbon dioxide, which will reveal future climate conditions.

The benefits of early carbon dioxide detection have been demonstrated in the 2017 eruption of Mayon volcano in the Philippines, where it allowed mass evacuations and saved more than 56,000 lives. It has its limitations, like bad terrain or too much environmental noise, but it could be a game-changer.

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Russian Researchers Discover 11 New AGNs in All-Sky X-ray Survey

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Russian Researchers Discover 11 New AGNs in All-Sky X-ray Survey

11 new active galactic nuclei were detected in an all-sky X-ray source survey conducted by researchers from the Russian Academy of Sciences. A team led by Grigory Uskov has been on an inspection of the X-ray sources found in the ART-XC telescope of the Spektr-RG (SRG) space observatory. So far, their studies have resulted in the identification of more than 50 AGNs and several cataclysmic variables. A deeper dive into the physical properties and radiation nature of those galaxies will be crucial for a wide range of studies such as statistical insights, refining and testing cosmological models, classification studies etc.

Classification of newly found AGN

According to the recent study published in Astronomy letters, the newly discovered active galactic nuclei from the ARTSS1-5 catalog are categorised as the Seyfert galaxies, seven type 1 (Sy 1), three type 1.9 (Sy 1.9) and one type 2 (Sy 2).

AGN or active galactic nuclei are considered as the most luminous persistent sources of electromagnetic radiation in the universe. These compact regions at the centre of a galaxy are extremely energetic due to accretion onto a supermassive black hole or star formation activity at the galaxy’s center.

Based on their luminosity, AGNs are categorised as Seyfert Galaxies and Quasars. Seyfert galaxies are lower-luminosity AGNs where the host galaxy is clearly visible and emit a lot of infrared radiation, and have broad optical emission lines.

Research findings

The published paper states the 11 newly found galaxies are located relatively nearby, at redshifts of 0.028-0.258. The X-ray luminosities of these sources are within the range of 2 to 300 tredecillion erg/s, therefore typical for AGNs at the present epoch.

The spectrum of one of the new AGNs, designated SRGA J000132.9+240237, is described by a power law with a slope smaller than 0.5, which suggests a strong absorption and a significant contribution of the radiation reflected from the galaxy’s dusty torus. The authors of the paper noted that longer X-ray observations are required to determine the physical properties of this AGN.

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New Study Reveals Recent Ice Gains in Antarctica, But Long-Term Melting Continues

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New Study Reveals Recent Ice Gains in Antarctica, But Long-Term Melting Continues

Global warming and climate change have been subjects of major concern for a long time. One of the key indicators of this phenomenon is the melting of ice in the polar regions. Researchers from Tongji University in Shanghai have been using NASA satellite data to track changes in Antarctica’s ice sheet over more than two decades. Their newest study states that despite the increase in global temperature, Antarctica has gained ice in recent years. However, it cannot be considered as a miraculous reversal in global warming because over these two decades, the overall trend is substantial ice loss. Most of the gains have been caused by unusual increased precipitation over Antarctica.

About the New study

According to the new study , NASA’s Gravity Recovery And Climate Experiment (GRACE) and GRACE Follow-On satellites have been monitoring this ice sheet since 2002. The ice sheet covering Antarctica is the largest mass of ice on Earth

The satellite data revealed that the sheet experienced a sustained period of ice loss between 2002 and 2020. The ice loss accelerated in the latter half of that period, increasing from an average loss of about 81 billion tons (74 billion metric tons) per year between 2002 and 2010, to a loss of about 157 billion tons (142 billion metric tons) between 2011 and 2020, according to the study. However, the trend then shifted.

The ice sheet gained mass from 2021 to 2023 at an average rate of about 119 billion tons (108 metric tons) per year. Four glaciers in eastern Antarctica also flipped from accelerated ice loss to significant mass gain.

General Trend in global warming

Climate change doesn’t mean that everywhere on Earth will get hotter at the same rate, so a single region will never tell the whole story of our warming world.

Historically, temperatures over much of Antarctica have remained relatively stable, particularly compared to the Arctic. Antarctica’s sea ice has also been much more stable relative to the Arctic, but that’s been changing in recent years.

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