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Indian Origin Scientist Kailash Sahu and team in US used Albert Einstein’s Theory to Weigh Stars

Kailash Chandra Sahu, an Indian-origin astronomer, led a group of scientists to weigh white dwarf stars using Einstein's General Theory of Relativity.

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Kailash Chandra Sahu
The Hubble Telescope hovering in space. Wikimedia
  • A team of scientists in the US has successfully weighed the mass of a white dwarf star using Einstein’s predictions and theory
  • The group of scientists was led by an Indian-origin astronomer Kailash Chandra Sahu
  • This is the first time that the weight of a star has been measured using Einstein’s theory

US, June 10, 2017: Albert Einstein’s General Theory of Relativity is a century old. Yet, every year new developments in scientific knowledge are emerging through this basic formulated theory by Einstein.

The theory of relativity has once again provided development in our knowledge of the cosmos. In the US, a group of scientists has measured the mass of a white dwarf star by using the century-old theory.

The group was led by an Indian-origin astronomer Kailash Chandra Sahu at the Space Telescope Science Institute. The team used the Hubble Space Telescope to calculate the mass. Sahu is also the lead author of the research paper.

ALSO READ: Albert Einstein’s Century-old Prediction Comes True: Third Gravitational Waves detected by Scientists

The essence of the study lies in the technicality used by the scientists. They observed the white dwarf star as it passed by a distant star. When the two stars closely aligned, scientists analyzed the deflection in the light of the distant star caused by the gravity of the white dwarf star. The deflection in the sky would appear offset by 2 milliarcseconds!

The deflection may be incredibly tiny but it helped the scientists calculate the dwarf’s mass.

Einstein had hypothesized that a ray of light from a different star passing by an object would bend due to the gravity pull of the passing object. The study is published in the journal called Science.

– by Saksham Narula of NewsGram. Twitter: @Saksham2394

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Donald Trump Planning to meet Putin during his Asia tour

Donald Trump's first trip to Asia is the longest international tour.

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US President Donald Trump
US President Donald Trump. wikimedia commns
  • US President Donald Trump said on Sunday that he expected to meet his Russian counterpart Vladimir Putin during his Asia tour.

“I think it’s expected we’ll meet with Putin, yeah. We want Putin’s help on North Korea, and we’ll be meeting with a lot of different leaders,” Donald Trump told reporters on Air Force One before landing at the Yokota Air Base in Japan, Efe reported.

Putin is scheduled to participate in the Asia-Pacific Economic Cooperation (APEC) summit in Da Nang, Vietnam, which Trump will also attend as part of his long Asia tour.

The North Korean nuclear threat is expected to dominate Donald Trump’s meetings in Japan and the next two stages of his tour, South Korea and China, where he will have a highly anticipated sit-down with Chinese President Xi Jinping.

The remainder of the tour will be more focused on economic issues, with Trump scheduled to take part in the APEC meeting in Da Nang and then in the Association of Southeast Asian Nations (ASEAN) Summit and the East Asia Summit in the Philippines.

Donald Trump’s first trip to Asia is the longest international tour by a US head of state since the one then-President George H.W. Bush embarked on in 1992.

Bush became ill at the end of that trip, famously vomiting on the Japanese prime minister’s lap at a formal dinner before fainting.(IANS)

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Giant planet orbiting a small star find stuns scientists: NGTS Survey

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(image:wikipedia)

London, Nov 1,2017: An international team of astronomers has found a gas giant the size of Jupiter orbiting a star half the size of the Sun, a discovery that challenges theories of planet formation which state that a planet of this size could not be formed by such a small star.

This unusual planet, NGTS-1b, is the largest planet compared to the size of its companion star ever discovered in the universe, according to the study to be published in an upcoming issue of the journal Monthly Notices of the Royal Astronomical Society.

“The discovery of NGTS-1b was a complete surprise to us — such massive planets were not thought to exist around such small stars,” said lead author of the research Daniel Bayliss from the University of Warwick in England.

According to existing theories of planet formation, small stars can readily form rocky planets but do not gather enough material together to form Jupiter-sized planets.

The planet NGTS-1b which is six hundred light years away from Earth is a hot Jupiter, at least as large as the Jupiter in our solar system, but with around 20 per cent less mass.

It is very close to its star — just three per cent of the distance between Earth and the Sun – and orbits the star every 2.6 days, meaning a year on NGTS-1b lasts two and a half days.

The temperature on the gassy planet is approximately 530 degrees Celsius, or 800 kelvin.

The researchers spotted the planet using the Next-Generation Transit Survey (NGTS) – a wide-field observing facility made of a compact ensemble of telescopes, designed to search for transiting planets on bright stars – run by the Universities of Warwick, Leicester, Cambridge, Queen’s University Belfast, Observatoire de Genève, DLR Berlin and Universidad de Chile.

The planet orbits a red M-dwarf — the most common type of star in the universe, leading to the possibility that there could be more of these planets waiting to be found by the NGTS survey.(IANS)

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Astronomers discovered Sun-like star that devoured its own planets

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Astronomers discovered Sun-like star that devoured its own planets

New York, Oct 13: Astronomers have discovered that a Sun-like star lurking around 350 light-years away consumed the rocky equivalent of 15 Earths.

Dubbed Kronos after the child-eating Titan of Greek mythology, the star is the clearest and most dramatic case yet of a Sun-like star consuming its own planets, said Semyeong Oh, astrophysicist at Princeton University in New Jersey and lead author of the study.

“Even if our Sun ate the entire inner solar system, it wouldn’t come close to the anomaly we see in this star,” study co-author David Hogg from the Flatiron Institute in New York added.

The research did not begin as a hunt for a planet-eater.

Oh was analysing a catalog of new star data collected by the European Space Agency’s Gaia spacecraft for pairs of stars with similar speeds and trajectories.

Such duos are typically twin stars that formed close together from the same ingredients.

The analysis ultimately led to the identification of Kronos and its lesser known brother Krios.

Their official designations are HD 240430 and HD 240429, and they are both about 350 light years from Earth.

The keys to the discovery were first confirming that the widely separated pair are in fact a binary pair, and secondly observing Kronos’ strikingly unusual chemical abundance pattern, Oh explained in a statement released by the Princeton University.

Other co-moving star pairs have had different chemistries, Oh explained, but none as dramatic as Kronos and Krios.

Most stars that are as metal-rich as Kronos “have all the other elements enhanced at a similar level,” she said, “whereas Kronos has volatile elements suppressed, which makes it really weird in the general context of stellar abundance patterns.”

In other words, Kronos had an unusually high level of rock-forming minerals, including magnesium, aluminium, silicon, iron, chromium and yttrium, without an equally high level of volatile compounds — those that are most often found in gas form, like oxygen, carbon, nitrogen and potassium, the study said. (IANS)