Largest celestial body to hit Earth in 100 years
The meteor which closely missed the Russian city of Chelyabinsk on Friday is likely to go down in history as the
largest celestial body to have hit the Earth over the past hundred years. NASA scientists said the object was a tiny
asteroid that released 300 to 500 kilotons of energy when it exploded, which is roughly equivalent to 20 atomic bombs
of the type dropped on Hiroshima and Nagasaki. This would make the Chelyabinsk meteor the largest since 1908 when a
meteor hit Tunguska in Siberia, levelling an estimated 80 million trees. The energy of the Tunguska blast is estimated
to have been up to 50 megatons.
Cosmic rays originate in the aftermath of exploding stars
Hundred years after Victor Hess discovered cosmic rays in 1912, astronomers have finally found proof of what they had
always suspected — but could not find direct evidence — that these highly energetic particles, which are constantly
bombarding the Earth’s atmosphere from all directions, originate in the aftermath of exploding stars, or supernovae as
they are called, which are the most energetic events in the galaxy. Importantly, the proof is doubly strengthened as
the evidence has come from two different experiments — one space-based and the other ground-based — which have looked
at different supernova remnants (SNRs) in different parts of the sky and interpreted their observations from different
physical perspectives. (thehindu)
Olive Ridley Turtles mass nesting begins in Odisha coast
A record number of over 3 lakh Olive Ridley turtles have laid eggs in Odisha coast within a span of only one week,
officials said. This time the turtles mostly laid their eggs near the river Rushikulya mouth in Ganjam district, about
60 km from here. The mass nesting of turtles began in Rushikulya river mouth on February 13.(ptinews)
Raman spectroscopy modulated for broader medical application
Scientists have modulated Indian Nobel laureate C V Raman's spectroscopy signals, opening the door to wider biomedical
and clinical applications such as real-time assessment of tissues during surgery. Raman spectroscopy has enabled
incredible advances in numerous scientific fields and is a powerful tool for tissue classification and disease
recognition, although there have been considerable challenges to using the method in a clinical setting. The inelastic
scattering of light from any sample is called the Raman effect, named after the Indian scientists and Nobel prize-
winner C V Raman, according to the study published in Biomedical Spectroscopy and Imaging. (ET)
Digital data created in country to grow by 50%
The digital information explosion driven by continued growth of internet usage, social networks, and smart phones
among and falling cost of technology, digitization among others will results in a 23-fold growth of India's digital
universe between 2012 and 2020. According to a EMC-sponsored IDC Digital Universe, the digital bits captured or
created each year in India is expected to grow from 127 exabytes to 2.9 zettabytes between 2012 and 2020. The study
also reveals that 22% of the digital universe in the country in 2012 is cloud enabled and is estimated to double by
2020 with 42% of digital information to be based on cloud technology. India and China together contribute 17% of the
digital universe and by 2020 the contribution from these two countries to the total digital universe is expected to be
as high as 29%, it added.(BS)
Apple second-largest smartphone maker by revenue in India
Apple's iPhone has become the second largest smartphone brand in terms of revenue and the fifth largest by volume in
India, muscling its way up the league tables helped by an advertising blitzkrieg and some aggressive pricing. In value
terms, it was still way behind Samsung's 38.8% share, but ahead of BlackBerry's 6%, while its volume grew more than
three times, putting the iPhone at fifth spot behind Samsung, Micromax, Sony and Nokia.(TOI)
This post contains the Science and Technology News of February 2013. These are short Science and Technology News notes for
quick review.
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