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Picture sent on twitter by NASA

Picture sent on twitter by NASA

Washington, In what may necessitate rewriting of science books, NASA’s New Horizons probe — after travelling over 4.8 billion km — on Tuesday flew past the mysterious dwarf planet Pluto on the outermost fringes of the solar system.

Flying past Pluto at a distance of about 12,500 km at around 5 p.m. (Indian standard Time), the probe, launched a decade ago, was expected to beam back key images of Pluto’s surface to Earth in about nine hours — the time it takes the communication to reach Earth from Pluto.


The images will also help scientists explore the mysterious Kuiper Belt — a huge band of planetary debris left over from the solar system’s formation 4.5 billion years ago.

The most dangerous hazards for the probe — flying at a speed of 45,000 km per hour — were dust particles trapped in orbit around Pluto and a strike can cripple the spacecraft, scientists said, but added that such a risk was very low.

The first images will debut on Facebook-owned photo-sharing website Instagram, NASA has announced.

“We made an editorial decision to give the world a sneak peek of the image on Instagram,” NASA social media manager John Yembrick told wired.com.

On board the New Horizons are seven sophisticated science instruments and the ashes of Clyde Tombaugh, the astronomer who discovered Pluto in 1930.

NASA was expecting a dark grey icy planet but the probe found it is red and appeared to be oxidized like Mars.

Earlier, the New Horizons probe settled one of the most basic questions about Pluto — its size. Mission scientists have found Pluto to be 2,370 km in diameter, somewhat larger than many prior estimates.

Images acquired with the Long Range Reconnaissance Imager (LORRI) on board the New Horizon probe were used to make this determination.

The result confirms that Pluto is larger than all other known solar system objects beyond the orbit of Neptune, the US space agency said in a statement.

“The size of Pluto has been debated since its discovery in 1930. We are excited to finally lay this question to rest,” said mission scientist Bill McKinnon from Washington University in St Louis.

Pluto’s newly-estimated size means that its density is slightly lower than previously thought, and the fraction of ice in its interior is slightly higher.

Measuring Pluto’s size has been a decades-long challenge due to complicating factors from its atmosphere.

Its largest moon Charon lacks a substantial atmosphere, and its diameter was easier to determine using ground-based telescopes.

New Horizons observations of Charon confirm its previous estimated size of 1,208 km across.

Two other moons – Nix and Hydra – were discovered using the Hubble Space Telescope in 2005. Nix is estimated to be about 35 km across while Hydra is roughly 45 km across.

These sizes lead mission scientists to conclude that their surfaces are quite bright, possibly due to the presence of ice.

Pluto’s two smallest moons, Kerberos and Styx, are smaller and fainter than Nix and Hydra and are harder to measure, the US space agency said.

(IANS)


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Photo by Alexander Shatov on Unsplash

Twitter has confirmed that its algorithms amplify right-leaning political content.

By Nikhila Natarajan

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"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.

gold Apple iPhone 6s displaying Twitter logo 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

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Snapdeal co-founder and COO Rohit Bansal on Friday lauded a man who facilitated 64 registrations for the vaccine on the CoWin portal.

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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)


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