NASA probe beams back ultraviolet images of Martian atmosphere

October 18, 2016

Washington, Oct 18: In a first, NASA's MAVEN spacecraft has beamed back ultraviolet images of Mars that unveils dynamic, previously invisible activities in the atmosphere of the red planet such as change in ozone levels over the seasons and formation of clouds.master

The images were taken by the Imaging UltraViolet Spectrograph (IUVS) on the Mars Atmosphere and Volatile Evolution mission (MAVEN) - a space probe designed to study the Martian atmosphere while orbiting Mars.

These were then used to make this movie of rapid cloud formation on Mars on July this year.

The movie uses four MAVEN images to show about seven hours of Mars rotation during this period, and interleaves simulated views that would be seen between the four images.

"MAVEN obtained hundreds of such images in recent months, giving some of the best high-resolution ultraviolet coverage of Mars ever obtained," said Nick Schneider from the University of Colorado, Boulder in the US.

Nightside images show ultraviolet (UV) "nightglow" emission from nitric oxide (NO). Nightglow is a common planetary phenomenon in which the sky faintly glows in the complete absence of external light.

Mars' nightside atmosphere emits light in the ultraviolet due to chemical reactions that start on Mars' dayside.

Ultraviolet light from the Sun breaks down molecules of carbon dioxide and nitrogen, and the resulting atoms are carried around the planet by high-altitude wind patterns that encircle the planet.

On the nightside, these winds bring the atoms down to lower altitudes where nitrogen and oxygen atoms collide to form nitric oxide molecules. The recombination releases extra energy, which comes out as ultraviolet light.

Scientists predicted NO nightglow at Mars, and prior missions detected its presence, but MAVEN has returned the first images of this phenomenon in the Martian atmosphere.

Splotches and streaks appearing in the images occur where NO recombination is enhanced by winds.

Such concentrations are clear evidence of strong irregularities in Mars' high altitude winds and circulation patterns. These winds control how Mars' atmosphere responds to its very strong seasonal cycles.

Dayside images show the atmosphere and surface near Mars' south pole in unprecedented ultraviolet detail. They were obtained as spring comes to the southern hemisphere.

Ozone is destroyed when water vapour is present, so ozone accumulates in the winter polar region where the water vapour has frozen out of the atmosphere.

The images show ozone lasting into spring, indicating that global winds are inhibiting the spread of water vapour from the rest of the planet into winter polar regions.

MAVEN observations also show afternoon cloud formation over the four giant volcanoes on Mars.
Clouds are a key to understanding a planet's energy balance and water vapour inventory, so these observations will be valuable in understanding the daily and seasonal behaviour of the atmosphere, researchers said.

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News Network
May 19,2020

Washington, May 19: As the scientists across the world are struggling to develop a vaccine for combating coronavirus, US drugmaker Moderna announced on Monday (local time) that the phase I trial of its Covid-19 vaccine has shown positive early results.

The company is hopeful that it's vaccine could be available to the public as early as January next year. Several firms across the world are in the race to develop a vaccine for the deadly virus which has claimed over 3 lakh lives worldwide.

CNN citing Dr. Tal Zaks, Moderna's chief medical officer reported that "if future studies go well, the company's vaccine could be available to the public as early as January".

"This is absolutely good news and news that we think many have been waiting for for quite some time," Zaks was quoted as saying.

Moderna, based in Cambridge, Massachusetts announced that the vaccine developed neutralising antibodies to the virus at levels reaching or exceeding the levels seen in people who have naturally recovered from Covid-19, reported CNN.

These will be followed by phase 2 trials and phase 3 trials, which Moderna plans to start in July.

President Donald Trump had on Friday said that that the United States will be able to deliver a few hundred million doses of COVID-19 vaccine, under 'Operation Warp Speed', by the end of this year.

"I have very recently seen early data from a clinical trial with a coronavirus vaccine and this data made me feel even more confident that we'll be able to deliver a few hundred million doses of vaccine by the end of 2020 and we will do the best we can," Trump had said at a press conference at the White House on Friday.

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News Network
January 28,2020

Jan 28: China said on Tuesday that 106 people had died from a new coronavirus that is spreading across the country, up from the previous toll of 81.

The number of total confirmed cases in China rose to 4,515 as of Jan. 27, the National Health Commission said in a statement, up from 2,835 reported a day earlier.

The United States warned against travel to China on Monday and Canada issued a more narrow travel warning as the death toll from the spreading coronavirus passed 100, with tens of millions stranded during the biggest holiday of the year and global markets rattled.

Global stocks fell, oil prices hit three-month lows, and China's yuan dipped to its weakest level in 2020 as investors fretted about damage to the world's second-biggest economy from travel bans and the Lunar New Year holiday, which China extended in a bid to keep people at home.

The health commission of China's Hubei province said on Tuesday that 100 people had died from the virus as of Jan. 27, according to an online statement, up from the previous toll of 76, with the number of confirmed cases in the province rose to 2,714.

Other fatalities have been reported elsewhere in China, including the first in Beijing, bringing the deal toll to 106 so far, according to the People's Daily. The state newspaper put the total number of confirmed cases in China at 4,193, though some experts suspect a much higher number.

On Monday, US President Donald Trump offered China whatever help it needed, while the State Department said Americans should "reconsider" visiting all of China due to the virus.

Canada, which has two confirmed cases of the virus and is investigating 19 more potential cases, warned its citizens to avoid travel to China's Hubei province, at the heart of the outbreak.

Authorities in Hubei province are taking increasing flak from the public over their initial response to the virus. Chinese Premier Li Keqiang visited the city of Wuhan, epicentre of the outbreak, to encourage medical workers and promise reinforcements.

Visiting Wuhan in blue protective suit and mask, Li praised medics, said 2,500 more workers would join them in the next two days, and visited the site of a new hospital to be built in days.

The most senior leader to visit Wuhan since the outbreak, Li was shown on state TV leading medical workers in chants of "Wuhan jiayou!" - an exhortation to keep their strength up.

China's ambassador to the United Nations, following a meeting with UN Secretary-General António Guterres on Monday, said "the Chinese government attaches paramount importance to prevention and control of the epidemic, and President Xi Jinping has given important instructions. ...

"China has been working with the international community in the spirit of openness, transparency and scientific coordination," he said.

Guterres said in a statement, "The UN appreciates China's effort, has full confidence in China's ability of controlling the outbreak, and stands ready to provide any support and assistance."

MOUNTING ANGER

On China's heavily censored social media, officials have faced mounting anger over the virus, which is thought to have originated from a market where wildlife was sold illegally.

Some criticised the governor of Hubei province, of which Wuhan is the capital, after he corrected himself twice during a news conference over the number of face masks being produced.

"If he can mess up the data multiple times, no wonder the disease has spread so severely," said one user of the Weibo social media platform.

In rare public self-criticism, Wuhan Mayor Zhou Xianwang said the city's management of the crisis was "not good enough" and indicated he was willing to resign.

The central Chinese city of 11 million people is in virtual lockdown and much of Hubei, home to nearly 60 million people, is under travel curbs.

Elsewhere in China, people from the region faced questioning about their movements. "Hubei people are getting discriminated against," a Wuhan resident complained on Weibo.

Cases linked to people who travelled from Wuhan have been confirmed in a dozen countries, from Japan to the United States, where authorities said they had 110 people under investigation in 26 states. Sri Lanka was the latest to confirm a case.

INVESTORS WORRIED

Investors are worried about the impact. The consensus is that in the short term, economic output will be hit as authorities limit travel and extend the week-long New Year holiday — when millions traditionally travel by rail, road and plane - by three days to limit spread of the virus.

Asian and European shares tumbled, with Japan's Nikkei average sliding 2%, its biggest one-day fall in five months. Demand spiked for safe-haven assets such as the Japanese yen and Treasury notes. European stocks fell more than 2%.

The US S&P 500 closed down nearly 1.6%.

"China is the biggest driver of global growth so this couldn't have started in a worse place," said Alec Young, FTSE Russell's managing director of global markets research.

During the 2002-2003 outbreak of Severe Acute Respiratory Syndrome (SARS), which originated in China and killed nearly 800 people globally, air passenger demand in Asia plunged 45%. The travel industry is more reliant on Chinese travellers now.

Chinese-ruled Hong Kong, which has had eight cases, banned entry to people who had visited Hubei recently.

Some European tour operators cancelled trips to China, while governments around the world worked on repatriating nationals.

Officially known as 2019-nCoV, the newly identified coronavirus can cause pneumonia, but it is still too early to know just how dangerous it is and how easily it spreads.

"What we know about this virus it that transmission occurs through human contact but we are speaking of close contact, i.e. less than a meter," said Jerome Salomon, a senior official with France's health ministry.

"Crossing someone (infected) in the street poses no threat," he said. "The risk is low when you spend a little time near that person and becomes higher when you spend a lot of time near that person."

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Agencies
June 2,2020

Washington, Jun 2: There is no place for hate and racism in the society, Microsoft CEO Satya Nadella has said, asserting that empathy and shared understanding are a start, but more needs to be done. Nadella’s remarks come in the wake of the custodial death of George Floyd, a 46-year-old African-American man who was pinned to the ground in Minneapolis on May 25 by a white police officer who kneeled on his neck as he gasped for breath.

“There is no place for hate and racism in our society. Empathy and shared understanding are a start, but we must do more,” Nadella said in a tweet on Monday.

“I stand with the Black and African American community and we are committed to building on this work in our company and in our communities,” Nadella said.

A day earlier, Google CEO Sunder Pichai expressed solidarity with the African-American community.

“Today on US Google & YouTube homepages we share our support for racial equality in solidarity with the Black community and in memory of George Floyd, Breonna Taylor, Ahmaud Arbery & others who don’t have a voice,” Pichai wrote on Twitter on Sunday.

“For those feeling grief, anger, sadness & fear, you are not alone,” Pichai said, sharing a screenshot of the Google search home page which said, “We stand in support of racial equality, and all those who search for it.”

Nadella’s Microsoft also said they will be using the platform to amplify voices from the Black and African American community at the company.

Nadella had also spoken out a few months ago about the discriminatory Citizenship Amendment Act passed in his native country. Talking to BuzzFeed’s editor-in-chief, Ben Smith, in Manhattan, Nadella said what’s happening in the country is “sad.”

“I think what is happening is sad. I feel, and in fact quite frankly, now being informed (and) shaped by the two amazing American things that I’ve observed which is both, it’s technology reaching me where I was growing up and its immigration policy and even a story like mine being possible in a country like this.

“I think, it’s just bad, if anything, I would love to see a Bangladeshi immigrant who comes to India and creates the next unicorn in India or becomes the CEO of Infosys. That should be the aspiration. If I had to sort of mirror what happened to me in the US, I hope that’s what happens in India,” Microsoft’s India-born CEO was quoted as saying by BuzzFeed.

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