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- The asteroid is called Didymos — Greek for “twin” — because it is an asteroid binary system that consists of two bodies
- The target for the first-ever mission to demonstrate an asteroid deflection technique for planetary defense — the Double Asteroid Redirection Test (DART)
- DART would fly to Didymos, and use an on-board autonomous targeting system to aim itself at Didymos B
July 10, 2017: Aiming to show how to protect Earth from a future killer asteroid strike, NASA plans to crash a refrigerator-sized spacecraft at a speed about nine times faster than a bullet into a space rock, forcing it to change its orbit.
The target for the first-ever mission to demonstrate an asteroid deflection technique for planetary defense — the Double Asteroid Redirection Test (DART) — is an asteroid that will have a distant approach to Earth in October 2022, and then again in 2024, NASA said.
“DART would be NASA’s first mission to demonstrate what’s known as the kinetic impactor technique — striking the asteroid to shift its orbit — to defend against a potential future asteroid impact,” said Lindley Johnson, planetary defence officer at NASA Headquarters in Washington.
The asteroid is called Didymos — Greek for “twin” — because it is an asteroid binary system that consists of two bodies — Didymos A, about 780 metres in size, and a smaller asteroid orbiting it called Didymos B, about 160 metres in size.
DART, scheduled for launch in 2020, would impact only the smaller of the two bodies, Didymos B.
The Didymos system has been closely studied since 2003. The primary body is a rocky S-type object, with the composition similar to that of many asteroids.
The composition of its small companion, Didymos B, is unknown, but the size is typical of asteroids that could potentially create regional effects should they impact Earth.
“A binary asteroid is the perfect natural laboratory for this test,” said Tom Statler, program scientist for DART at NASA Headquarters.
“The fact that Didymos B is in orbit around Didymos A makes it easier to see the results of the impact, and ensures that the experiment doesn’t change the orbit of the pair around the sun,” Statler added.
After launch, DART would fly to Didymos, and use an on-board autonomous targeting system to aim itself at Didymos B.
Then the spacecraft would strike the smaller body at a speed about nine times faster than a bullet, approximately six kilometres per second.
Earth-based observatories would be able to see the impact and the resulting change in the orbit of Didymos B around Didymos A, allowing scientists to better determine the capabilities of kinetic impact as an asteroid mitigation strategy.
The kinetic impact technique works by changing the speed of a threatening asteroid by a small fraction of its total velocity, but by doing it well before the predicted impact so that this small nudge will add up over time to a big shift of the asteroid’s path away from Earth.
“DART is a critical step in demonstrating we can protect our planet from a future asteroid impact,” saiid Andy Cheng of The Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, the DART investigation co-lead. (IANS)
With the festive season on in full swing, iconic brand Johnnie Walker, is all set to re-energize the country's after-hour culture. Through its one-of-a-kind campaign #RevibeTheNight, the brand brings together beloved music artists like Divine, Ritviz, Lisa Mishra, Taba Chake along with popular indie bands like When Chai Met Toast and Mad Boy Mink, among others to perform live across iconic community spaces in India.
The collaborative effort by Johnnie Walker aims to bring back the after-hour culture through live performances across popular hotspots in India. The brand's goal is drive social regeneration in India and bring back the vibe of socializing through local music artists and reignite the trade, driving social culture by executing the live events with Covid measures in place and a limited capacity audience capacity.
The collaborative effort by Johnnie Walker aims to bring back the after-hour culture through live performances across popular hotspots in India. | Photo by Vishnu R Nair on Unsplash
Prior to the world going into lockdown, the after-hour culture in India bloomed at celebrated community hubs, that eventually became a safe-haven for individuals, a place where they found their sense of self-expression and belonging, that fuelled progress. This community was driven through the culture of live music and enthralling performances that created their very own vibe, a vibe that built extraordinary, forever-lasting relationships. Through #ReVibeTheNight, one can reconnect with this community bringing music curated by artists who have a history of captivating crowds with their one-of-a-kind live experiences. Catch the gigs and live performances for artists in these venues/cities for the live performances.
(Artiicle originally published on IANSlife) (IANS/ MBI)
Keywords: johnnie walker, social, #revibethenight, performances, community, artists, culture, festivity, begin
By Nikhila Natarajan
In a continuing study on the effects of machine learning (ML) on public conversation, Twitter has confirmed that its algorithms amplify right-leaning political content. "In six out of seven countries - all but Germany - tweets posted by accounts from the political right receive more algorithmic amplification than the political left when studied as a group," Twitter blogged.
"Right-leaning news outlets, as defined by the independent organisations, see greater algorithmic amplification on Twitter compared to left-leaning news outlets." Since 2016, Twitter users are able to choose between viewing algorithmically ordered tweets first in their home timeline or viewing the most recent tweets in reverse chronological order.
"An algorithmic home timeline displays a stream of tweets from accounts we have chosen to follow on Twitter, as well as recommendations of other content Twitter thinks we might be interested in based on accounts we interact with frequently, tweets we engage with, and more. "As a result, what we see on our timeline is a function of how we interact with Twitter's algorithmic system, as well as how the system is designed."
The new research is based on tweets of elected officials of House of Commons members in Canada, the French National Assembly, the German Bundestag, House of Representatives in Japan, Congress of Deputies of Spain, House of Commons in the UK, and official and personal accounts of House of Representatives and Senate members in the US, as well as news outlets, from April 1 to August 15, 2020.
Tweets about political content from elected officials, regardless of party or whether the party is in power, do see algorithmic amplification when compared to political content on the reverse chronological timeline. | Photo by Sara Kurfeß on Unsplash
The study was conducted by Ferenc Huszar (Twitter, University of Cambridge), Sofia Ira Ktena (now at DeepMind Technologies), Conor O'Brien (Twitter), Luca Belli (Twitter), Andrew Schlaikjer (Twitter), and Moritz Hardt (UC Berkeley).
The questions probed were:
How much algorithmic amplification does political content from elected officials receive in Twitter's algorithmically ranked Home timeline versus in the reverse chronological timeline? Does this amplification vary across political parties or within a political party?
Are some types of political groups algorithmically amplified more than others? Are these trends consistent across countries?
Are some news outlets amplified more by algorithms than others? Does news media algorithmic amplification favour one side of the political spectrum more than the other?
Tweets about political content from elected officials, regardless of party or whether the party is in power, do see algorithmic amplification when compared to political content on the reverse chronological timeline. (IANS/ MBI)
Keywords: algorithmically, timeline, algorithmic, tweets, political, survey, twitter, study, germany, skew
Even as India celebrates reaching a milestone of 100 crore Covid vaccine doses, Snapdeal co-founder and COO Rohit Bansal on Friday lauded a man who facilitated 64 registrations for the vaccine on the CoWin portal. In a video shared on his Facebook and Twitter page, Bansal hailed Sonu Kumar as a "citizen celebrity".
Bansal said that Kumar not only helped "just co-workers and family but complete strangers too. With patience, empathy and uncanny jugaad". He added that Kumar joined him "many moons ago" and completed his open school from a parking lot.
"Education has helped this wonderful man enable others to get India back on track. Bravo! The CoWin portal on Thursday mentioned that a total of 100 crore vaccine doses has been administered so far to the eligible population under the vaccination drive in India, nine months after the nationwide inoculation programme was started to protect the people against Covid-19.
"It's a cause of significant celebration and happiness," Bansal said in the video. He said that while people just help a few around them, Kumar "bridged the digital gap" for 64 people, who were finding it difficult to register themselves online on the vaccine portal. Kumar said he doesn't feel that he has contributed much towards the 100 crore vaccine dose count. "I have been able to help only 64 people, if I was able to help more I would have been happier." (IANS/ MBI)
Keywords: cowin, covid, india, people, Rohit bansal, Sonu kumar, vaccine, snapdeal, registrations