stars – आवारा मुसाफिर

The messy death of a star

December 10, 2022794 Views

A global forensic team of astronomers led by Australia’s Macquarie University reconstructs using stunning James Webb Space Telescope images Around 2500 years ago, a star ejected most of its gas, forming the beautiful Southern Ring Nebula, NGC 3132, chosen as one of the first five image packages from the James Webb Space Telescope (JWST). A team of nearly 70 astronomers from 66 organisations across Europe, North, South and Central America, and Asia have used the JWST images to piece together the messy death of this star. “It was nearly three times the size of our Sun, but much younger, about 500 million years old. It created shrouds of gas that have expanded out from the ejection site, and left a remnant dense white dwarf star, with about half the mass of the Sun, but approximat...

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Scientists have spotted the farthest Galaxy ever

AWARA MUSAFIR BUREAU

April 7, 2022257 Views

Offers clues about the primordial universe An international team of astronomers, including researchers at the Center for Astrophysics | Harvard & Smithsonian, has spotted the most distant astronomical object ever: a galaxy. Named HD1, the galaxy candidate is some 13.5 billion light-years away and is described in the Astrophysical Journal. In an accompanying paper published in the Monthly Notices of the Royal Astronomical Society Letters, scientists have begun to speculate exactly what the galaxy is. The team proposes two ideas: HD1 may be forming stars at an astounding rate and is possibly even home to Population III stars, the universe’s very first stars — which, until now, have never been observed. Alternatively, HD1 may contain a supermassive black hole about 100 million t...

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Stellar ‘vampire’ finds love at first bite with companion star

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March 3, 2022767 Views

“Closest black hole” system found to contain no black hole Astronomers have gotten a good look at what happens when a "vampire" star sucks the outer layers of material from a companion star, stripping this "bitten" victim down to a mere stellar core. In 2020 a team led by European Southern Observatory (ESO) astronomers reported the closest black hole to Earth, located just 1000 light-years away in the HR 6819 system. But the results of their study were contested by other researchers, including by an international team based at KU Leuven, Belgium. In a paper published on Wednesday, these two teams have united to report that there is in fact no black hole in HR 6819, which is instead a “vampire” two-star system in a rare and short-lived stage of its evolution. The original study on...

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AstroSat helps spot rare UV-bright stars in a massive cosmic dinosaur in the Milky Way

AWARA MUSAFIR BUREAU

January 22, 2021538 Views

Astronomers exploring the massive intriguing globular cluster in our Galaxy called NGC 2808 that is said to have at least five generations of stars have spotted rare hot UV-bright stars in it. These stars whose inner core is almost exposed, making them very hot, exist in the late stages of evolution of a Sun-like star. It is not clear how these stars end their lives as not many of them are detected in these fast-evolving phases, making their study crucial. A false colour image of the globular cluster NGC 2808 obtained using AstroSat/UVIT. The stars as seen using far-UV (FUV) filter are shown in blue colour, and the yellow colour is used to show the stars observed in near-UV (NUV). Motivated by the fact that old globular clusters referred to as dinosaurs of the universe present excel...

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Chile’s night sky protectors seek legal defense for the stars

AWARA MUSAFIR BUREAU

September 26, 2020979 Views

On the open expanses of Chile’s high-altitude Atacama desert, bright stars pierce an ink-black firmament, a lure for stargazers looking for wonder and astronomers seeking signs of life on distant planets. Chile’s arid northern deserts have attracted massive investment in telescopes in recent years and the country is home to nearly half the world’s astronomical observatories. Parabolic antennas of the ALMA (Atacama Large Millimetre/Submillimeter Array) project are seen at the El Llano de Chajnantor in the Atacama desert, Antofagasta, Chile in a File Photo. ESO/Babak Tafreshi (twanight.org)/Handout via REUTERS Now, under threat from light pollution coming from urban sprawl and development, Chile’s environmental defenders are starting a fight to keep the skies dark, with legal muscl...