General Awareness

SCIENCE & TECHNOLOGY - January 2019

Jan 2019

Mar 26, 2022

More than 1,200 Doordarshan Analogue Terrestrial TV (ATT) Transmitters Shut Down

In March 2022, more than 1,200 Doordarshan Analogue Terrestrial TV (ATT) transmitters have been shut down in a phased manner as they had become obsolete, said Anurag Singh Thakur, the Minister of Information and Broadcasting . This, in view of emerging trends in the broadcasting and availability of "DD Free Dish", a free-to-air Direct to Home service of Prasar Bharati, under which over 150 TV channels including 51 educational ones were being provided free of cost, without any monthly subscription.

Mar 25, 2022

Milky Way Evolved in Few Different Phases, New Research Suggests

The formation of our Milky Way Galaxy can be split up qualitatively into different assembly phases that resulted in its structurally different stellar populations: the halo and the disk components. Revealing a quantitative overall picture of Milky Way's assembly requires a large sample of stars with very precise ages. In new research, astronomers at the Max-Planck Institute for Astronomy analyzed such a sample using subgiant stars.
Subgiant stars, which are stars sustained by hydrogen shell fusion, can be unique tracers for such purposes, as they exist in the brief stellar evolutionary phase that permits the most precise and direct age determination, because their luminosity is a direct measure of their age.
Moreover, the chemical element compositions determined from the spectra of their photosphere surfaces accurately reflect their birth material composition billions of years ago.
"This makes subgiants the best practical tracers of Galactic archaeology, even compared to main-sequence turn-off stars, whose surface abundances may be altered by atomic diffusion effects.

Mar 24, 2022

There are 5,000 Worlds Outside Our Solar System, Some Like Earth

When humans began looking into the sky, the first thought that popped the scientific curiosity was 'are we alone in the universe?' In time, we discovered planets around the Sun, separated by billions of kilometers, forming our solar system. NASA went a step beyond that cosmic boundary and confirmed there are more than 5,000 worlds waiting to be explored in deep space.
With the discovery of 65 new planets, NASA confirmed the presence of over 5000 such planetary bodies around stars beyond our solar system, marking a new milestone in space exploration. The NASA exoplanet archive got 65 new candidates to be studied that could harbour compositions that might support the presence of water, microbes, gases on the surface or even life.

Mar 23, 2022

Newly Proposed Experiment Could Confirm that Information is Fifth State of Matter

Dr. Melvin Vopson, a physicist with the School of Mathematics and Physics at the University of Portsmouth, has already published research suggesting that information has physical mass and that all elementary particles store information about themselves. Now, the researcher designed an experiment, which if proved correct, means he will have discovered that information is the fifth form of matter, alongside solid, liquid, gas and plasma.

Mar 22, 2022

New Form of Ice Discovered: Ice VIIt

Physicists have observed the transition from a previously known cubic phase, ice VII, to the newly-discovered intermediate, and tetragonal, phase, ice VIIt, before settling into another known phase, ice X.
Water ice is like many other materials in that it can form different solid materials based on variable temperature and pressure conditions, like carbon forming diamond or graphite.
However, water is exceptional in this aspect as there are at least 20 solid forms of ice known to scientists.
The water sample was first squeezed between the tips of two opposite-facing diamonds — freezing into several jumbled ice crystals.
The ice was then subjected to a laser-heating technique that temporarily melted it before it quickly re-formed into a powder-like collection of tiny crystals.
By incrementally raising the pressure, and periodically blasting it with the laser beam, the physicists observed the transition from cubic ice VII to a structure of tetragonal symmetry, ice VIIt.

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