NASA’s Curiosity Mars rover recently set a record for the steepest terrain it’s ever climbed, cresting the “Greenheugh Pediment,” a broad sheet of rock that sits atop a hill. And before doing that, the rover took a selfie, capturing the scene just below Greenheugh.
In front of the rover is a hole it drilled while sampling a bedrock target called “Hutton.” The entire selfie is a 360-degree panorama stitched together from 86 images relayed to Earth. The selfie captures the rover about 11 feet (3.4 meters) below the point where it climbed onto the crumbling pediment.
Curiosity finally reached the top of the slope March 6 (the 2,696th Martian day, or sol, of the mission). It took three drives to scale the hill, the second of which tilted the rover 31 degrees—the most the rover has ever tilted on Mars and just shy of the now-inactive Opportunity rover’s 32-degree tilt record, set in 2016. Curiosity took the selfie on Feb. 26, 2020 (Sol 2687).
Since 2014, Curiosity has been rolling up Mount Sharp, a 3-mile-tall (5-kilometer-tall) mountain at the center of Gale Crater. Rover operators at NASA’s Jet Propulsion Laboratory in Southern California carefully map out each drive to make sure Curiosity will be safe. The rover is never in danger of tilting so much that it would flip over—Curiosity’s rocker-bogie wheel system enables it to tilt up to 45 degrees safely—but the steep drives do cause the wheels to spin in place.
How Are Selfies Taken?
Before the climb, Curiosity used the black-and-white Navigation Cameras located on its mast to, for the first time, record a short movie of its “selfie stick,” otherwise known as its robotic arm.
Curiosity’s mission is to study whether the Martian environment could have supported microbial life billions of years ago. One tool for doing that is the Mars Hand Lens Camera, or MAHLI, located in the turret at the end of the robotic arm. This camera provides a close-up view of sand grains and rock textures, similarly to how a geologist uses a handheld magnifying glass for a closer look in the field on Earth.
By rotating the turret to face the rover, the team can use MAHLI to show Curiosity. Because each MAHLI image covers only a small area, it requires many images and arm positions to fully capture the rover and its surroundings.
“We get asked so often how Curiosity takes a selfie,” said Doug Ellison, a Curiosity camera operator at JPL. “We thought the best way to explain it would be to let the rover show everyone from its own point of view just how it’s done.”
Jet Propulsion Laboratory
Curiosity Mars rover takes a new selfie before record climb (2020, March 21)
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article image Antarctica was home to a rainforest 90 million years ago – Digital Journal
A team of researchers led by geoscientists from the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research in Germany and scientists from Imperial College London, UK. have discovered fossil soil dating to the mid-Cretaceous Period, about 90 million years ago, suggesting that the climate was exceptionally warm at the time.
Their analysis of the preserved roots, pollen, and spores show that dense concentrations of atmospheric CO2 would have created much hotter global temperatures, melting polar ice sheets, and sending sea levels soaring to up to 170 meters (558 feet) higher than they are today. Their work was published in the journal Nature on April 1, 2020.
Co-author Professor Tina van de Flierdt, from the Department of Earth Science & Engineering at Imperial, said, per Science Daily: “The preservation of this 90-million-year-old forest is exceptional, but even more surprising is the world it reveals. Even during months of darkness, swampy temperate rainforests were able to grow close to the South Pole, revealing an even warmer climate than we expected.”
Attention-grabbing sediment layer
During an expedition in 2017, aboard the RV Polarstern in the Amundsen Sea, researchers drilled deep underneath the seabed of West Antarctica, close to the location of the Pine Island and Thwaites glaciers, and only about 900 kilometers (560 miles) away from the South Pole.
What they pulled up from a depth of about 30 meters “quickly caught our attention. It clearly differed from the layers above it,” lead author Dr. Johann Klages, a geologist at the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research in Germany, said in a press release.
“The first analyses indicated that, at a depth of 27 to 30 meters (88 to 98 ft) below the ocean floor, we had found a layer originally formed on land, not in the ocean.”
No one has ever pulled a Cretaceous Period sample out of the ground from such a southern point on the planet before – but the research team was not prepared for what they would find out after a further examination of the sediment was done with X-ray computed tomography (CT) scans.
Back on land, the CT Scans revealed soil that was so well-preserved that it still contained traces of pollen, spores, and remnants of flowering plants. Even intact individual cell structures could be observed. This all pointed to the preserved remains of an ancient rainforest that existed in Antarctica approximately 90 million years ago.
“The numerous plant remains indicate that the coast of West Antarctica was, back then, a dense temperate, swampy forest, with many conifers and tree ferns similar to the forests found in New Zealand today,” says palaeoecologist Ulrich Salzmann from Northumbria University in the UK.
An interesting reason for the unprecedented find
So how could it have been possible for a rainforest to grow and thrive at the South Pole? We do know that the mid-Cretaceous was the heyday of the dinosaurs – but was also the Earth’s warmest period in the past 140 million years, with ocean temperatures thought to be as high as 95 degrees Fahrenheit.
Then, as now, the South Pole would have been subjected to four months of unyielding darkness during the Antarctic winter. How could this ancient rainforest thrive, deprived of the Sun for so long? Based on biological and geochemical data contained in the soil sample, researchers used modeling to reconstruct what the ancient climate of this long-gone forest region might have been like.
They found out that atmospheric CO2 levels would have needed to be significantly higher than scientists realized. It was a super-heated environment, with an average air temperature of around 12 degrees Celsius or 54 degrees Fahrenheit in the Antarctic.
“Before our study, the general assumption was that the global carbon dioxide concentration in the Cretaceous was roughly 1,000 parts per million (ppm),” explains geoscientist Torsten Bickert from the University of Bremen in Germany. “But in our model-based experiments, it took concentration levels of 1,120 to 1,680 ppm to reach the average temperatures back then in the Antarctic.”
There is still one big question to be answered: If Antarctica used to be so warm, what caused it to dramatically cool, asks CBS News, allowing the formation of ice sheets? According to co-author and AWI climate modeler Dr. Gerrit Lohmann, in all of their climate simulations, researchers were “unable to find a satisfactory answer.”
Rangers' Panarin, others donate N95 masks to hospitals – National Post
New York Rangers forward Artemi Panarin provided quite the assist by aiding frontline health care workers in the battle against the coronavirus.
Panarin purchased and arranged the delivery of 1,500 N95 masks to Hospital for Special Surgery in New York.
“We are so grateful for Artemi Panarin’s incredibly generous gift of N95 masks to HSS,” said Dr. Bryan Kelly, the surgeon-in-chief at Hospital for Special Surgery, per NHL.com.
“Along with his teammates, Panarin also created a video thanking HSS for our commitment to helping NYC during this pandemic. On behalf of every clinical staff member at HSS, we would like to offer our heartfelt thanks to Panarin for his generosity during this time. Additionally, we’d like to thank Jim Ramsay, head athletic trainer for the Rangers, for his help coordinating their efforts.”
The masks were delivered on Friday.
Panarin is not alone, as Florida Panthers goaltender Sergei Bobrovsky and New York Islanders netminder Semyon Varlamov also purchased and arranged delivery of the N95 masks to hospitals in their respective markets.
Per NHL.com, Bobrovsky reportedly donated thousands of masks to multiple hospitals in the area of Fort Lauderdale, Fla.
Varlamov joined his teammates in donating 3,000 masks to Northwell Health system on Long Island.
“A heartfelt thanks to the @NYIslanders for supporting our Northwell Health #healthcareheroes with your delivery of N95 masks this week!” Northwell Health Foundation tweeted from the @GiveToNorthwell account.
N95 masks are in demand among medical providers because they help prevent a person from inhaling small, airborne infectious particles — a primary means of transmitting the coronavirus.
As of Sunday morning, more than 1.2 million people around the world had been diagnosed with the disease, with more than 67,000 fatalities, according to Johns Hopkins University.
–Field Level Media
Earth's crust is shaking less as people stay home – MENAFN.COM
(MENAFN – IANS)
London, April 5 (IANS) The COVID-19 lockdowns globally have not only made air breathable or rivers clean but have also resulted in the way our Earth moves, as researchers now report a drop in seismic noise (the hum of vibrations in the planets crust) because transport networks, real estate and other human activities have been shut down.
According an article in the journal Nature, efforts to curb the spread of coronavirus mean that the planet itself is moving a little less, which could “allow detectors to spot smaller earthquakes and boost efforts to monitor volcanic activity and other seismic events”.
Vibrations caused by moving vehicles and industrial machinery produce background noise, which reduces seismologists’ ability to detect other signals occurring at the same frequency.
“A noise reduction of this magnitude is usually only experienced briefly around Christmas,” said Thomas Lecocq, a seismologist with the Royal Observatory of Belgium in Brussels which has observed the drop in seismic noise.
Data from a seismometer at the observatory show that measures to curb the spread of COVID-19 in Brussels caused human-induced seismic noise to fall by about one-third.
In Belgium, scientists report at least a 30 per cent reduction in that amount of ambient human noise since lockdown began there.
The current drop has boosted the sensitivity of the observatory’s equipment, improving its ability to detect waves in the same high frequency range as the noise, said the Nature article.
However, not all seismic monitoring stations will see an effect as pronounced as the one observed in Brussels.
According to Emily Wolin, a geologist at the US Geological Survey in Albuquerque, New Mexico, many stations are purposefully located in remote areas to avoid human noise.
“These should see a smaller decrease, or no change at all, in the level of high-frequency noise they record,” she was quoted as saying.
The fall in noise could also benefit seismologists who use naturally occurring background vibrations, such as those from crashing ocean waves, to probe Earth’s crust.
A fall in human-induced noise could boost the sensitivity of detectors to natural waves at similar frequencies
“There’s a big chance indeed it could lead to better measurements,” said Lecocq.
The reduction in seismic activity, like reduction in air pollution, also show that people are adhering to social distancing guidelines.
“From the seismological point of view, we can motivate people to say, ‘OK look, people. You feel like you’re alone at home, but we can tell you that everyone is home. Everyone is doing the same. Everyone is respecting the rules,'” Lecocq told CNN.
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