General Awareness

SCIENCE & TECHNOLOGY - May 2015

May 2015

Jan 28, 2019

Gsat-31 to Replace Dying Sat

Isro will get its communication satellite Gsat-31 launched from French Guiana. Arianespace will launch Gsat-31 on February 6. The satellite will replace Insat-4CR, whose life is expected to end soon.
Though Gsat-31 is not a heavy satellite (2,600kg), the services of Arianespace are being used as it is an emergency launch to replace the dying Insat satellite so that communication services are not affected.
Gsat-31 satellite can only be launched with GSLV Mk III. But MK III rockets are already booked for Chandrayaan-2 and other important missions.
Arianespace will also launch Gsat-30 in June. This satellite will replace dying satellite Insat-4A.

Kerosene to Boost GSLV Mk III's Payload Capacity

Indian Space Research Organisation (Isro) is working on upgrading its heavylifter GSLV Mk III where the upper stage of the rocket will have highly refined form of kerosene as fuel in order to increase its payload capability.
To increase the payload capability of GSLV Mk III from 4 tonnes to 6 tonnes, ISRO is in the process of making some improvements in rocket stages. First, working on enhancing the cryogenic stage fuel loading from 25 tonnes to 30 tonnes. Second, working on changing the core stage L110 — which has 110 tonnes of unsymmetrical dimethylhydrazine (UDMH) and dinitrogen tetroxide (N2O4).
This is to replace L110 stage with semi-cryogenic engine that will carry liquefied oxygen and highly refined kerosene called kerolox (aka RP-1) instead of liquefied hydrogen.

Jan 27, 2019

Nasa Probe Transmits Image of Deep Space Object

A space snowman visited by Nasa on New Year's Day is pitted all over and has a bright "collar" between its two fused spheres.
These are the newest details to emerge about Ultima Thule, the most distant object ever explored by humanity.
A close-up picture taken by Nasa's New Horizons spacecraft right before closest approach on January 1, shows lots of little pits on Ultima Thule — located in the so-called Kuiper Belt.
They are less than a 0.7 kilometre across. There's also a much bigger, circular depression on the smaller lobe, considered the snowman's head. Scientists don't know if these are impact craters or sinkholes.
Categorised as a contact binary, the approximately 32-kilometre-long, reddish Ultima Thule has both light and dark patterns. The brightest spot is where the two lobes connect.
Scientists say the varied shading may help explain how the ancient object was formed, as the solar system was emerging 4.5 billion years ago.
Launched in 2006, the spacecraft became the first visitor to the dwarf planet Pluto in 2015. Ultima Thule was its second target. A third destination — even deeper inside Kuiper Belt on the frozen fringes of our solar system — could be possible in the 2020s.

Jan 26, 2019

NASA's Opportunity Rover Completes 15 Years on Mars

NASA's Opportunity rover that went into hibernation after a dust storm swept over the region and blocked sunlight from reaching it, has completed 15 years on the Red Planet.
The rover landed in a region called Meridiani Planum on January 25, 2004, sending its first signal back to Earth from the surface at 12.05am.
The golf-cart-sized rover was designed to travel 1,006 metres and operate on the Red Planet for 90 Martian days (sols). It has travelled over 45 km and logged its 5,000th Martian day last February.
Opportunity's last communication with Earth was received June 10, 2018, as a planet-wide dust storm blanketed the solar powered rover's location on the western rim of Perseverance Valley, eventually blocking out so much sunlight that the rover could no longer charge its batteries.
Although the storm eventually abated and the skies over Perseverance cleared, the rover has not communicated with Earth since then.

Jan 25, 2019

Bezos's Blue Origin Rocket Makes 10th Flight Test

With an eye on launching the first tourists to space by year's end, Blue Origin, the rocket company owned by Amazon CEO Jeff Bezos, blasted off the 10th test flight of its New Shepard rocket.
The rocket, carrying no people on board but eight science experiments for Nasa, soared skyward from a launchpad in Texas. A few minutes into the flight, the capsule separated from the booster and reached its peak height of 106km.
The frontier of space is internationally agreed to be 100km above Earth, known as the Karman Line.
Eight minutes after blast off, the rocket booster fired its engines and made a controlled, upright landing back on Earth, marking the fourth flight for this particular rocket, and the 10th flight test for New Shepard overall.

China Clones 'Insomniac' Monkeys

Monkeys cloned from a macaque that was genetically engineered to have a sleep disorder at the Chinese Academy of Sciences in Shanghai.
Researchers found that the five new monkeys — born over the past six months — showed signs of mental problems associated with sleep disorders, including depression, anxiety and behaviour linked to schizophrenia.
The findings could aid research into human psychological illnesses because scientists would be able to create animals with specific disorders

Boeing's Flying Car Takes off

A Boeing flying car designed to whisk passengers over congested city streets and dodge skyscrapers completed its first test flight, offering a peek into the future of urban transportation the aerospace giant and others are seeking to shape.
A prototype of its autonomous passenger air vehicle completed a controlled takeoff, hover and landing during the test conducted in Manassas, Virginia.
Propelled by electricity, the model is designed for fully autonomous flight, with a range of 50 miles.
The Chicago-based plane maker and rival Airbus are among a slew of companies racing to stake a claim on flying cars, which has the potential to be the next disruption to sweep the aerospace industry.
Boeing's push was boosted by a 2017 acquisition of Aurora Flight Sciences, whose projects include a new flying taxi it is developing with Uber.

Jan 24, 2019

'Roshni' to help visually impaired identify notes

The Indian Institute of Technology, Ropar, has come to the aid of visually impaired, who have been facing difficulty in identifying the new currency notes introduced by the Reserve Bank of India, post demonetisation.
The application "Roshni" is free of cost.
"Roshni" was the first Android app that worked successfully with new INR currency notes.
The user after downloading "Roshni" from the Play Store has to bring the currency note in front of the phone camera and the app will provide audio notification intimating the currency note's denomination.
If the image is not clear or not focussed, or the desirable minimum prediction accuracy is not achieved, the user is provided aural notification to "try again".
The usability aspects were considered in designing this app and it worked in a broad range of light conditions and holding angles.

Isro Set to Launch Key Mission

An Isro mission will rocket into the record books at 11.37 pm on 24 January.
The rocket will be launched from Satish Dhawan Space Centre in Sriharikota. It will carry Microsat-R, a 700-kg imaging satellite of the Defence Research and Development Organisation, and SKI Kalamsat V2, a 1.2kg satellite developed by students of Space Kidz India (SKI), Chennai.
The flight will set a record for two reasons. It will be the first time that the fourth stage of a Polar Satellite Launch Vehicle (PSLV) will not be discarded as usual.
It will be converted into an orbital platform to carry out experiments by students.
The PSLV is also being flown with two strap-on motors (called PSLC-DL) for the first time. It usually employs six.

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