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
June 3,2020

Islamabad, Jun 3: Pakistan has reported a record 4,132 fresh cases of the coronavirus in the last 24 hours, taking the total number of infections to 80,463, the health ministry said on Wednesday.

The Ministry of National Health and Services said the new infections were detected after conducting a maximum of 17,370 tests in a day.

Of the total cases, Sindh has so far detected 31,086 patients of the coronavirus, Punjab 29,489, Khyber-Pakhtunkhwa 10,897, Balochistan 4,747, Islamabad 3,188, Gilgit-Baltistan 779 and Pakistan-occupied Kashmir reported 289 patients of the viral disease.

"In total 67 patients died in the last 24 hours, taking the tally of deaths to 1,688. Another 28,923 people have fully recovered from the disease," the ministry said in a statement.

The authorities have so far carried out 595,344 tests in the country.

Officials said that Pakistan has more than 100 labs that can conduct over 30,000 tests per day and the number of daily tests will be gradually increased to the maximum level.

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Agencies
July 7,2020

Washington, Jul 7: The US House of Representatives Judiciary Committee will grill the CEOs of US tech giants Apple, Google, Facebook and Amazon during an antitrust hearing on July 27.

Apple's Tim Cook, Facebook's Mark Zuckerberg, Alphabet's Sundar Pichai and Amazon's Jeff Bezos will testify before the antitrust panel that is working on proposals to reform and regulate the digital market.

The hearing would mark the first time all four top executives testify together in front of Congress, virtually or in-person depending on the panel's call in the COVID-19 pandemic times.

"Since last June, the Subcommittee has been investigating the dominance of a small number of digital platforms and the adequacy of existing antitrust laws and enforcement," House Judiciary Committee Chairman Jerrold Nadler (D-NY) and Antitrust Subcommittee Chairman David Cicilline (D-RI) said in a statement on Monday.

"Given the central role these corporations play in the lives of the American people, it is critical that their CEOs are forthcoming. As we have said from the start, their testimony is essential for us to complete this investigation.”

The House Judiciary Committee announced its antitrust probe into the four tech giants in June last year.

Last month, the committee sent letters to technology giants Apple, Facebook, Amazon and Alphabet (Google's parent company), asking them to confirm if their chief executives will testify as part of the committee's tech competition investigation.

Committee chair David Cicilline said the documents that the investigators sought were "essential" to the probe and that requests like this were part of the "appropriate process" to obtain them.

"The only CEO who has expressed reservation about appearing, through a representative, has been Amazon," Cicilline said. "No one in this country is above the law ... nobody is above answering a congressional subpoena".

The lawmakers want the tech giants to furnish documents that have been produced in relation to other competition probes and internal communications.

The letters that the committee sent also posed questions related to possible harms to competition in the market.

In addition to the antitrust probe, Apple's App Store policies are also facing scrutiny from the US Department of Justice.

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Agencies
January 15,2020

Washington, Jan 15: The historic impeachment trial of US President Donald Trump will begin on Tuesday next week, Mitch McConnell, the leader of the Senate's Republican majority, has announced.

Earlier on Tuesday (January 14), Speaker Nancy Pelosi ended the standoff between the Senate and the Democratic-controlled House of Representatives saying that it would vote on next Tuesday to send the impeachment documents to the upper house so it can hold the trial on charges that Trump obstructed Congress and abused presidential powers.

This will be only the third time in the nation's history that a US president is tried after impeachment and Trump can expect to be acquitted like his two predecessors - Bill Clinton in 1998 and Andrew Johnson in 1868 - because there won't be a two-thirds majority to convict and remove him from office.

McConnel told reporters on Tuesday that preparations like swearing in the Senators as jurors for the trial could begin this week ahead of the formal start on next Tuesday.

"This Impeachment Hoax is an outrage," Trump tweeted, repeating his longstanding complaint about it, when the move to hold the trial finally appeared to gain traction.

"The American people deserve the truth and the Constitution demands a trial," Pelosi said.

She had held on to the Articles of Impeachment - the chargesheet against Trump - that the House voted on December 18 in a bid to pressure McConnell to accept her terms for holding the trial and in an attempt to get some Republican senators to break ranks on procedural matters.

But she has agreed to let the process move forward, without an agreement on the main Democratic demand to call in their witnesses at the trial and to introduce new evidence.

The House Intelligence Committee, which conducted the investigation against the president, on Tuesday released what it said was new evidence from Lev Parnas, a former associate of Trump's personal lawyer Rudy Giuliani. Parnas is facing criminal charges.

Pelosi said that starting the trial without witnesses or documents "a pure political cover-up."

The impeachment process is only an investigation by the House and the framing of the chargesheet for the Senate trial that will be presided over by Chief Justice John Roberts with the Senators as jurors and nominees of the House as prosecutors.

While there is no chance for removal of Trump from office, Democrats see the Senate trial as a propaganda mechanism ahead of the elections in November by giving the charges against Trump another public airing and turning voter opinion against Republican senators facing re-election.

Trump called for an outright dismissal of the impeachment by the Senate, but McConnell said, "There is little or no sentiment in the Republican conference for a motion to dismiss."

He added, "Our members feel that we have an obligation to listen to the arguments."

Trump tweeted that by not dismissing the impeachment out of hand, the Senate trial was giving "credence to a trial based on the no evidence, no crime" and "the partisan Democrat Witch Hunt credibility."

Pelosi had hoped to make some Republican senators break ranks with the leaders on the procedures for the trial and has partially succeeded in this as at least four of them appear open to witnesses being called.

While Trump's conviction and ouster from office is virtually impossible because of the two-thirds vote requirement in the 100-member Senate, only a simple majority is required on procedural matters. The Republicans have 53 members and four of them shifting positions could make a difference here.

McConnell appeared confident that he would have a hold on his party senators to set the rules for the trial.

Whether witnesses would be called to testify is still open as the Republicans have said that it would be decided when the trial starts.

The main sticking point is the Democrats demand to call their witnesses to testify at the trial.

The Democrats did not allow the Republicans to call their own witnesses to testify during the impeachment proceeding in the House and Republicans did not seem inclined to oblige them in the Senate.

Trump tweeted, "'We demand fairness' shouts Pelosi and the Do Nothing Democrats, yet the Dems in the House wouldn't let us have 1 witness, no lawyers or even ask questions."

The charges against Trump stem from a July phone call he had with Ukraine's President Volodymyr Zelensky in which he asked him as a "favour" to investigate former Vice President Joe Biden and his son Hunter.

Democrats say that this was an abuse power and amounted to inviting foreign interference in US elections as Biden is the leading candidate for the Democratic nomination to run against Trump in this year's election.

They also say that he withheld crucial military aid to Ukraine, a US ally against Russia, to pressure Zelensky and this endangered US national security. Trump said he delayed the aid to make sure the new government stomped out corruption.

Hunter Biden, who was made to leave the Navy because of alleged drug use and had no experience in the energy industry or in Ukrainian businesses was appointed a director of a gas company there and received monthly payments of $83,000, according to Republicans.

The former vice president, who was looking after Ukrainians affairs, had a prosecutor looking into gas company removed.

He and the Democrats say that it was because the prosecutor was corrupt, while Republicans see it as a conflict of interest.

The obstruction of Congress resulted from Trump's refusal to provide documents that the House demanded and allow some administration officials to testify at the House hearings.

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