Astronomers capture most distant star ever seen
Washington: American astronomers have captured the most distant normal star ever observed, some 9 billion light years from Earth, thanks to a rare cosmic alignment.
The study, published on Monday online in the journal Nature Astronomy, revealed the discovery of a star called Icarus, magnified by gravitational lensing by over 2,000 times, reported Xinhua.
Astronomers routinely study galaxies much farther away, visible because they glow with the brightness of billions of stars. They also managed to study supernova, often brighter than the galaxy in which it sits.
However, for a distance of about 100 million light years, the stars in these galaxies are impossible to make out individually.
But a phenomenon called gravitational lensing, the bending of light by massive galaxy clusters in the line of sight, can magnify the distant universe and make dim, far away objects visible.
The single star was discovered in NASA Hubble Space Telescope images taken in late April of 2016 and as recently as April 2017.
"You can see individual galaxies out there, but this star is at least 100 times farther away than the next individual star we can study, except for supernova explosions," said Patrick Kelly at the University of Minnesota, Twin Cities, the paper's first author.
These observations can provide a rare look at how stars evolve, especially the most luminous ones.
"For the first time ever we're seeing an individual normal star - not a supernova, not a gamma ray burst, but a single stable star - at a distance of nine billion light years," said Alex Filippenko, a professor of astronomy at UC Berkeley and one of many co-authors of the report.
The B-type star Icarus is much larger, more massive, hotter and possibly hundreds of thousands of times intrinsically brighter than our Sun.
According to the researchers, an extended lens, like a galaxy cluster, can only magnify a background object up to 50 times, but smaller objects can magnify much more.
A single star in a foreground lens, if precisely aligned with a background star, can magnify the background star thousands of times.
In this case, a star about the size of our sun briefly passed directly through the line of sight between the distant star Icarus and Hubble, boosting its brightness significantly.
Also, if the alignment was perfect, that single star within the cluster turned the light from the distant star into an "Einstein ring": a halo of light created when light from the distant star bends around all sides of the lensing star.
The ring is too small to discern from this distance, but the effect made the star easily visible by magnifying its apparent brightness.
The astronomers predict that Icarus will be magnified many times over the next decade as cluster stars move around, perhaps increasing its brightness as much as 10,000 times.
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Sensex rises nearly 295 pts to close at 2025-high on foreign fund inflows, drop in crude prices
Mumbai, May 5 (PTI): Benchmark BSE Sensex climbed nearly 295 points to close at an over four-month high on Monday following sustained foreign fund inflows and a sharp correction in global crude oil prices.
Rising for the second in a row, the 30-share BSE barometer gained 294.85 points or 0.37 per cent to settle at 80,796.84, marking its highest close in 2025 so far. During the day, it jumped 547.04 points or 0.67 per cent to 81,049.03.
The NSE Nifty rose 114.45 points or 0.47 per cent to 24,461.15, its highest closing level in 2025.
Among Sensex firms, Adani Ports jumped 6.29 per cent amid reports that Gautam Adani's representatives met with US administration officials to seek the dismissal of criminal charges in a bribery probe. All other listed Adani group stocks, including Adani Enterprises, Adani Ports, Adani Power and Adani Green Energy, ended with sharp gains.
Bajaj Finserv, Mahindra & Mahindra, Eternal, Power Grid, ITC, Tata Motors, Asian Paints and Hindustan Unilever were also among Sensex gainers.
Among the laggards, Kotak Mahindra Bank tanked 4.57 per cent after the firm reported a 7.57 per cent decline in consolidated net profit to Rs 4,933 crore for the March quarter of FY25, primarily due to elevated stress in the microlending book.
State Bank of India, Axis Bank, Titan and IndusInd Bank were among the other losers.
State Bank of India dipped over 1 per cent after it reported an 8.34 per cent decline in consolidated net profit to Rs 19,600 crore for the January-March quarter compared to Rs 21,384 crore a year ago, impacted by a decline in net interest margins.
Foreign Institutional Investors (FIIs) bought equities worth Rs 2,769.81 crore on Friday, according to exchange data.
Foreign investors injected Rs 4,223 crore into the country's equity market in April, as they turned net buyers for the first time in three months amid a blend of favourable global cues and robust domestic fundamentals.
The inflow of foreign capital came last month following a back-to-back net outflow of Rs 3,973 crore in March, Rs 34,574 crore in February, and Rs 78,027 crore in January.
"The market has sustained its positive momentum, though the level of optimism has decreased. Continued foreign inflows and record GST collections in April indicate resilience in economic activity, fostering mild hopefulness. A weak dollar and a decline in oil prices have further bolstered FII sentiment.
"However, the market's momentum is moderating, with action shifting from broad-based movements to stock and sector-specific trends based on results," Vinod Nair, Head of Research, Geojit Investments Limited, said.
The BSE midcap gauge jumped 1.45 per cent and smallcap index climbed 1.23 per cent.
Among sectoral indices, services jumped the most 2.99 per cent, followed by oil & gas (1.95 per cent), auto (1.88 per cent), consumer discretionary (1.58 per cent), utilities (1.50 per cent) and energy (1.49 per cent).
Bankex emerged as the only loser.
As many as 2,563 stocks advanced while 1,459 declined and 180 remained unchanged on the BSE.
Markets in South Korea, Japan, China and Hong Kong were closed due to holidays.
European markets were trading on a mixed note.
US markets ended significantly higher on Friday.
Global oil benchmark Brent crude dropped 1.45 per cent to USD 60.40 a barrel.
The 30-share BSE benchmark gauge settled 259.75 points, or 0.32 per cent, higher at 80,501.99 on Friday. The Nifty eked out a marginal gain of 12.50 points, or 0.05 per cent, to settle at 24,346.70.
