3D images show what lies beneath Mars poles

January 4, 2017

Washington, Jan 4: Scientists using data from a NASA probe have unveiled 3D subsurface images of Mars polar ice caps, showing previously obscured layering, larger volume of frozen carbon dioxide and bowl-shaped features that may be buried impact craters.mars

The information will help scientists better understand Martian climate changes and may allow them to determine the age of the polar caps without using climate models.

The 3D data volumes were assembled from observations by the Shallow Radar (SHARAD) onboard NASA's Mars Reconnaissance Orbiter (MRO) during more than 2000 orbit passes over each Martian pole.

"We have applied industry-developed techniques in a very novel fashion to a martian dataset, producing 3D volumes that are each over 600 times larger than any terrestrial or planetary dataset of this kind," said Nathaniel E Putzig, a senior scientist at the Planetary Science Institute in the US.

"It is gratifying to see so plainly in the SHARAD volumes structures that took years of effort to characterise with the single-orbit profiles," Putzig said.

Layering seen at the surface of the martian polar caps has been studied for decades. It has long been thought to represent a record of climate changes on that planet.

The interior structures of the caps remained a mystery until the arrival of radar sounders at Mars in the last decade.

An early version of the north polar 3D volume helped to assess the quantity of water ice transferred to the polar caps in the most recent retreat from a martian ice age.

First looks at the south polar 3D volume indicate that previously mapped deposits of carbon dioxide ice are somewhat larger than reported.

In both polar 3D volumes, known impact craters in and near the polar caps that are partially filled with ice have distinctive bowl-shaped signatures in the radar data, and similar signatures are found elsewhere within the polar ices but without any surface expression.

Whether the latter structures truly are impact craters remains to be determined.
Age estimates of planetary surfaces throughout the solar system rely on statistical data for impact craters on the Moon's surface calibrated to radiometrically dated samples returned during the Apollo programme.

This method has been used to estimate the surface ages of the martian polar caps, but estimates for the ages of the caps themselves have had to rely on numerical models of past climate changes.

If a sufficient number of the bowl-shaped features found in the radar volumes are shown to be impact craters, scientists will be able to assess the age of the polar caps using cratering statistics alone.

The extent to which age estimates from this new volumetric method agree or disagree with those from climate models will have important implications for the accuracy of these dating techniques.

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News Network
February 21,2020

London, Feb 21: Scientists have discovered a new species of land snail, and have named it Craspedotropis Greta Thunberg in honour of the Swedish activist Greta Thunberg for her efforts to raise awareness about climate change.

According to the study, published in the Biodiversity Data Journal, the newly discovered species belongs to the so-called caenogastropods -- a group of land snails known to be sensitive to drought, temperature extremes, and forest degradation.

The scientists, including evolutionary ecologist Menno Schilthuizen from Naturalis Biodiversity Center in the Netherlands, said the snails were found very close to the research field station at Kuala Belalong Field Studies Centre in Brunei.

They added that the snails were discovered at the foot of a steep hill-slope, next to a river bank, foraging at night on the green leaves of understorey plants.

The effort aided by amateur scientist J.P. Lim, who found the first individual of the snail said, "Naming this snail after Greta Thunberg is our way of acknowledging that her generation will be responsible for fixing problems that they did not create."

"And it's a promise that people from all generations will join her to help," Lim said.

The researchers said they approached Thunberg who said that she would be "delighted" to have this species named after her.

The study work including, fieldwork, morphological study, and classification of identified specimen was carried out in a field centre with basic equipment and no internet access, the scientists said.

According to the study, the work was done by untrained ‘citizen scientists’ guided by experts, on a 10-day taxon expedition.

"While we are aware that this way of working has its limitations in terms of the quality of the output (for example, we were unable to perform dissections or to do extensive literature searches), the benefits include rapid species discovery and on-site processing of materials," the researchers wrote in the study.

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Agencies
March 3,2020

Facebook on Monday launched a new consumer marketing campaign in India titled 'More Together'. India is the first country in the Asia Pacific region where such a campaign is being rolled out.

It is also the first time that Facebook is rolling out a 'high decibel campaign of this stature in India', the company said in a statement.

It is also the first time that Facebook is rolling out a 'high decibel campaign of this stature in India', the company said in a statement.

"India is at the heart of Facebook and one of our focus areas this year is to tell the exciting story of a service that is deeply embedded in the fabric of India," said Ajit Mohan, Vice President and Managing Director, Facebook India.

The campaign would have multiple campaigns over the next few weeks in eight languages and the one will be set in the context of Holi.

Facebook in 2019 introduced a new company logo to further distinguish the company from the Facebook app.

The company recently announced the appointment of Avinash Pant as the Marketing Director for India operations, to drive the consumer marketing efforts across the family of apps.

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Agencies
July 19,2020

New Delhi, Jul 19: Indian equities will be driven by a host of factors like corporate earnings, coronavirus cases trend and geo-political developments this week, according to analysts.

Market participants will also keenly watch the progress of monsoon, with experts saying that the farm sector revival will play a key role in lifting the coronavirus-hit economy.

"With no major event, the ongoing earnings season and global cues will continue to dictate the market trend. Besides, the progress of monsoon will also be closely watched," Ajit Mishra, VP - Research, Religare Broking, said.

Globally, the rising coronavirus infections and geo-political tensions have created uncertainty on the economic recovery front.

With India's COVID-19 cases fast approaching the 11 lakh mark, the third-highest behind the US and Brazil, and the death toll nearing 27,000, participants are expected to tread cautiously going forward.

At global level, confirmed COVID-19 cases have crossed 1.4 crore and deaths totalled about 6 lakh.

Markets globally will closely follow developments on the trade and political level between the US and China, according to analysts.

"We would continue witnessing stock-specific action as the earnings season unfold. Though the near-term momentum looks positive, we would advise traders to be cautious, given flaring US-China trade relations, persistent rise in virus cases and implementation of fresh lockdowns in parts of the country," said Siddhartha Khemka, Head - Retail Research, Motilal Oswal Financial Services Ltd.

HDFC Bank will remain in focus on Monday after having announced its June quarter earnings on Saturday.

The lender reported 19.6 per cent rise in its standalone net profit at Rs 6,658.62 crore for April-June 2020; while its income rose to Rs 34,453.28 crore during the quarter.

Other major companies to announce their quarterly results this week are Axis Bank, Bajaj Finance, Hindustan Unilever Limited, Bajaj Auto and ITC.

"Going ahead market participants will closely track the development related to covid vaccine, the rising infection of coronavirus, development on economic activities, corporate earnings and US-China relationship," said Sumeet Bagadia, Executive Director, Choice Broking.

On weekly basis, the Sensex gathered 425.81 points or 1.16 per cent, and the Nifty gained 133.65 points or 1.24 per cent.

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