Science & Technology Current Affairs - 2019
Science & Technology Current Affairs 2019-2020 category comprises current affairs with all important national / international updates in science and tech and events for the year 2019-2020 for UPSC, States, Civil services, SSC and other competitive examinations of India and States.
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The scientists at John Hopkins Applied Physics Laboratory, US, have developed Lithium-Ion batteries that can operate under extreme conditions like submersion, ballistic impact, cutting and heat. In simple lay man terms, they can operate even under fire!
The Lithium-Ion batteries that are commonly used in every household item starting from smartphones are susceptible to catastrophic fire and explosion. Because of this, many phones were banned from airlines and ships. The US Navy had prohibited the use of e-cigarettes on ships and submarines because of the danger the batteries possessed.
The Technology behind the battery
The scientists have used water-in-salt and water-in-bisalt electrolytes in the batteries. These electrolytes were incorporated in a polymer matrix to reduce water activity and elevate energy capabilities of the battery. This gives the batteries higher energies to withstand heat and pressure.
Tags: lithium • Lithium Ion Cell technology • Lithium-ion cell • Smartphones • Storage Batteries
NASA astronauts Jessica Meir and Christina Koch made history when they ventured outside International Space Station (ISS) for first ever all women spacewalk. It was the first time in more than half a century of space exploration that two women astronauts walked in space together.
Christina Koch had already carried out four spacewalks but it was the first such mission for Jessica Meir, who became the 15th woman to walk in space.
They spent seven hours outside ISS replacing a failed power control unit and made their way to a location called Port 6 truss structure to replace battery charge-discharge unit (BCDU).
NASA was hoping to have an all-female spacewalk in March 2019 but it was then canceled after astronaut Anne McClain discovered that spacesuit she was to wear did not fit properly, due to which astronaut Nick Hague went in her place.
First woman to spacewalk– Russian Svetlana Savitskaya on 25 July 1984. She went outside USSR’s Salyut 7 space station for 3 hours, 35 minutes.
First person (in history) to spacewalk– Soviet cosmonaut Alexei Leonov.