Facebook bans app that misused data of millions of users

Washington DC, Jun 8: Astronomers acting on a hunch have likely resolved a mystery about young, still-forming stars and regions rich in organic molecules closely surrounding some of them.

They used the National Science Foundation's Karl G Jansky Very Large Array (VLA) to reveal one such region that previously had eluded detection and that revelation answered a longstanding question.

The regions around the young protostars contain complex organic molecules which can further combine into prebiotic molecules that are the first steps on the road to life.

The regions, dubbed "hot corinos" by astronomers, are typically about the size of our solar system and are much warmer than their surroundings, though still quite cold by terrestrial standards.

The first hot corino was discovered in 2003 and only about a dozen have been found so far. Most of these are in binary systems, with two protostars forming simultaneously.

Astronomers have been puzzled by the fact that, in some of these binary systems, they found evidence for a hot corino around one of the protostars but not the other.

"Since the two stars are forming from the same molecular cloud and at the same time, it seemed strange that one would be surrounded by a dense region of complex organic molecules and the other wouldn't," said Cecilia Ceccarelli, of the Institute for Planetary Sciences and Astrophysics at the University of Grenoble (IPAG) in France.

The complex organic molecules were found by detecting specific radio frequencies, called spectral lines, emitted by the molecules. Those characteristic radio frequencies serve as "fingerprints" to identify the chemicals.

The astronomers noted that all the chemicals found in hot corinos had been found by detecting these "fingerprints" at radio frequencies corresponding to wavelengths of only a few millimetres.

"We know that dust blocks those wavelengths, so we decided to look for evidence of these chemicals at longer wavelengths that can easily pass through dust," said Claire Chandler of the National Radio Astronomy Observatory, and principal investigator on the project.

"It struck us that dust might be what was preventing us from detecting the molecules in one of the twin protostars," added Chandler.

The astronomers used the VLA to observe a pair of protostars called IRAS 4A, in a star-forming region about 1,000 light-years from Earth. They observed the pair at wavelengths of centimetres.

At those wavelengths, they sought radio emissions from methanol, CH3OH (wood alcohol, not for drinking). This was a pair in which one protostar clearly had a hot corino and the other did not, as seen using the much shorter wavelengths.

The result confirmed their hunch. "With the VLA, both protostars showed strong evidence of methanol surrounding them. This means that both protostars have hot corinos. The reason we did not see the one at shorter wavelengths was because of dust," said Marta de Simone, a graduate student at IPAG who led the data analysis for this object.

The astronomers cautioned that while both hot corinos now are known to contain methanol, there still may be some chemical differences between them. That, they said, can be settled by looking for other molecules at wavelengths not obscured by dust.

"This result tells us that using centimetre radio wavelengths is necessary to properly study hot corinos," Claudio Codella of Arcetri Astrophysical Observatory in Florence, Italy, said.

"In the future, planned new telescopes such as the next-generation VLA and SKA, will be very important to understanding these objects," added Codella.

New Delhi, Feb 24: They hail from vastly different backgrounds — Donald Trump is the son of a property tycoon while Narendra Modi is a descendant of a poor tea-seller.

Yet the two teetotallers, loved by right-wing nationalists in their home countries, share striking similarities that have seen them forge a close personal bond, analysts say.

Ahead of the American leader's first official visit to India, which begins in Modi's home state of Gujarat on Monday, the world's biggest democracy has gone out of its way to showcase the chemistry between them.

In Gujarat's capital Ahmedabad, large billboards with the words "two dynamic personalities, one momentous occasion" and "two strong nations, one great friendship" have gone up across the city.

"There's a lot that Trump and Modi share in common, and not surprisingly these convergences have translated into a warm chemistry between the two," Michael Kugelman of the Washington-based Wilson Center said.

"Personality politics are a major part of international diplomacy today. The idea of closed-door dialogue between top leaders has often taken a backseat to very public and spectacle-laden summitry."

Since assuming the top political office in their respective countries — Modi in 2014 and Trump in 2017 — the two men have been regularly compared to each other.

Trump, 73, and Modi, 69, both command crowds of adoring flag-waving supporters at rallies. A virtual cult of personality has emerged around them, with their faces and names at the centre of their political parties' campaigns.

A focus of Trump's administration has been his crackdown on migrants, including a travel ban that affects several Muslim-majority nations, among others, while critics charge that Modi has sought to differentiate Muslims from other immigrants through a contentious citizenship law that has sparked protests.

Both promote their countries' nationalist and trade protectionist movements — Trump with his "America First" clarion call and Modi with his "Make in India" mantra.

And while they head the world's largest democracies, critics have described the pair as part of a global club of strongmen that includes Russia's Vladimir Putin and Brazil's Jair Bolsonaro.

"There are many qualities that Trump and Modi share — a love for political grandstanding and an unshakable conviction that they can achieve the best solutions or deals," former Indian diplomat Rakesh Sood said.

Modi and Trump have sought to use their friendship to forge closer bonds between the two nations, even as they grapple with ongoing tensions over trade and defence.

Despite sharing many similarities in style and substance, analysts say there are some notable differences between the pair.

Modi is an insider who rose through the ranks of the Bharatiya Janata Party after starting out as a cadre in Rashtriya Swayamsevak Sangh.

Trump is a businessman and a political outsider who has in some sense taken over the Republican Party.

"Modi is a more conventional leader than is Trump in that he hasn't sought to revolutionise the office he holds in the way that Trump has," said Kugelman, a longtime observer of South Asian politics.

He added that genuine personal connections between leaders of both countries have helped to grow the partnership.

"George Bush and Manmohan Singh, Barack Obama and Singh, Obama and Modi, now Modi and Trump — there has been a strong chemistry in all these pairings that has clearly helped the relationship move forward," he added.

Trump has also stood by the Indian leader during controversial decisions, including his revocation of autonomy for Kashmir and his order for jets to enter Pakistani territory following a suicide bombing.

Analysts said the leaders would use the visit to bolster their image with voters.

A mega "Namaste Trump" rally in Ahmedabad on Monday will be modelled after the "Howdy, Modi" Houston extravaganza last year when the Indian leader visited the US and the two leaders appeared before tens of thousands of Indian-Americans at a football stadium.

"The success of this visit... will have a positive impact on his (Trump's) re-election campaign and the people of Indian origin who are voters in the US — a majority of them are from Gujarat," former Indian diplomat Surendra Kumar said.

"On the Indian side, the fact that Prime Minister Modi... (shares) such warmth, bonhomie and informality with the most powerful man on Earth adds to his stature... as well as with hardcore supporters."

Bengaluru, Jan 17: India’s latest communication satellite GSAT-30 was successfully launched from the Spaceport in French Guiana during the early hours on Friday.

In a press release, ISRO, has stated that the launch vehicle 'Ariane-5 VA-251' was blasted off from Kourou Launch Base, French Ginana at 0230 hours, carrying India’s GSA-30 and EUTELSAT KONNECT for Eutelasat, as per schedule.

The Ariane 5 upper stage in an elliptical Geosynchronous Transfer Orbit.

With a lift-off mass of 3,357 kg, GSAT-30 will provide continuity to operational services on some of the in-orbit satellites.

GSAT-30 derives its heritage from ISRO’s earlier INSAT/GSAT satellite series and will replace INSAT-4A in orbit.

“GSAT-30 has a unique configuration of providing flexible frequency segments and flexible coverage. The satellite will provide communication services to Indian mainland and islands through Ku-band and wide coverage covering Gulf countries, a large number of Asian countries and Australia through C-band," ISRO Chairman Dr K Sivan said.

Dr Sivan also said that “GSAT-30 will provide DTH Television Services, connectivity to VSATs for ATM, Stock-exchange, Television uplinking and teleport Services, Digital Satellite News Gathering (DSNG) and e-governance applications. The satellite will also be used for bulk data transfer for a host of emerging telecommunication applications.”

ISRO’s Master Control Facility (MCF) at Hassan in Karnataka took over the command and control of GSAT-30 immediately after its separation from the launch vehicle. Preliminary health checks of the satellite revealed its normal health.

In the days ahead, orbit-raising maneuvers will be performed to place the satellite in Geostationary Orbit (36,000 km above the equator) by using its onboard propulsion system.

During the final stages of its orbit raising operations, the two solar arrays and the antenna reflectors of GSAT-30 will be deployed. Following this, the satellite will be put in its final orbital configuration.

The satellite will be operational after the successful completion of all in-orbit tests.