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New Delhi: In 2011, the Nobel Prize was awarded to three scientists for discovering that the Universe is expanding at an ever-accelerating rate
through observations of distant supernovae. Now a team of Indian astronomers observing such distant supernovae have narrowed down the possible mechanisms of explosion of such supernovae which provide key measures of cosmological distances.
Their detailed study of a supernova called SN 2017hpa, a particular type of supernovae called I a supernova, which exploded in 2017 helped narrow down the explosion mechanism of the supernovae by observations of unburned carbon in the early phase spectra.
The explosive death of a star as a supernova is one of the most spectacular and catastrophic events in the Universe. Type Ia supernovae are the result of explosions of white dwarfs that exceed their mass beyond the Chandrasekhar limit through accretion of matter. Their homogeneous nature makes them extremely good standardizable candles to mea
International Space Station | A space for science, experiments and unity
Updated:
Updated:
April 24, 2021 21:55 IST
Global cooperation in space research faces challenges with Russia considering leaving the ISS and launching its own station
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Global cooperation in space research faces challenges with Russia considering leaving the ISS and launching its own station
The International Space Station (ISS) is a landmark of international cooperation. For over 20 years, it has seen intense collaboration between the U.S., Russia, the EU, Japan and Canada, and has played host to people from 19 countries since its launch in 1998. This scenario appears to be coming to an end, as Russian space agency Roscosmos’s chief has declared that Russia is ready to build its own space station and launch it by 2030 if President Vladimir Putin would give the go ahead. Further, in an interview to Russian TV, Deputy Prime minister Yuri Borisov said Russia would give notice and leave
December: Geminids
The constellation, which the meteor shower has been named after, is considered the radiant point of the shower, explains Ladia. In simple terms, as the Earth nears this debris, that constellation is the point from where the shower appears to begin, to us.
Ladia calls this radiant point a meteor shower’s “address in the sky”. Whichever constellation it seems to be coming from, he says, is what the meteor shower is named after: Lyrids for Lyra, Geminids for Gemini, Perseid for Perseus and so on.
How powerful a meteor shower is, depends on a number of factors, such as how numerous the debris is, the size of each individual particle, its luminosity, and its rate per hour. The standard for measuring that last factor, says Ladia, “is zhr or zenithal hourly rate: how many meteors can one person see per hour on a clear night. It is the measure of the quality of a meteor shower.”
iiap res in Indian Institute of Astrophysics coolsocial.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from coolsocial.net Daily Mail and Mail on Sunday newspapers.