US-Russian crew returns from space station: NASA TV

Crew members of the International Space Station (ISS) expedition 55-56, NASA astronauts Andrew Feustel (L), Roscosmos cosmonaut Oleg Artemyev (C) and Richard Arnold pose as they attend the final training for their upcoming space mission in Star City outside Moscow on February 21, 2018. (AFP)
Updated 28 February 2018
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US-Russian crew returns from space station: NASA TV

WASHINGTON: A capsule carrying two US astronauts and a Russian cosmonaut from the International Space Station landed in snowy Kazakhstan on Wednesday after a five-and-a-half month mission, a NASA TV live broadcast showed.
The Soyuz spacecraft brought back Joe Acaba and Mark Vande Hei, from the US National Aeronautics and Space Administration, and Alexander Misurkin, from Russian space agency Roscosmos.
The capsule landed in the snow covered steppe some 90 miles southeast of the central city of Zhezkazgan at 8.31 a.m. (0231 GMT).
Misurkin was the first to emerge from the spacecraft, assisted by members of the Russian search and recovery team, and he was followed by Acaba who smiled and made a thumbs-up gesture.
The trio had spent five-and-a-half months at the ISS, a $100 billion lab that flies about 250 miles (400 km) above Earth.
The are due to be replaced by NASA’s Andrew Feustel and Richard Arnold, and Oleg Artemyev of Roscosmos, whose spacecraft will blast off from the Baikonur cosmodrome, also in Kazakhstan, on March 21.


Thaw of Antarctic ice lifts up land, might slow sea level rise

Updated 22 June 2018
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Thaw of Antarctic ice lifts up land, might slow sea level rise

  • The fast rise of the bedrock beneath will lift ever more of the ice onto land, reducing the risks of a breakup of the sheet caused by warming ocean water seeping beneath the ice
  • The process was too slow to save the ice sheet from a possible collapse triggered by global warming

OSLO: Antarctica’s bedrock is rising surprisingly fast as a vast mass of ice melts into the oceans, a trend that might slow an ascent in sea levels caused by global warming, scientists said on Thursday.
The Earth’s crust in West Antarctica is rising by up to 4.1 centimeters (1.61 inches) a year, an international team wrote in the journal Science, in a continental-scale version of a foam mattress reforming after someone sitting on it gets up.
The rate, among the fastest ever recorded, is likely to accelerate and could total 8 meters (26.25 feet) this century, they said, helping to stabilize the ice and brake a rise in sea levels that threatens coasts from Bangladesh to Florida.
“It’s good news for Antarctica,” lead author Valentina Barletta of the Technical University of Denmark and Ohio State University told Reuters of the findings, based on GPS sensors placed on bedrock around the Amundsen Sea in West Antarctica.
Much of the West Antarctic ice sheet, which has enough ice to raise world sea levels by more than three meters (10 feet) if it ever all melted, rests on the seabed, pinned down by the weight of ice above.
The fast rise of the bedrock beneath will lift ever more of the ice onto land, reducing the risks of a breakup of the sheet caused by warming ocean water seeping beneath the ice.
The uplift “increases the potential stability of the West Antarctic Ice Sheet against catastrophic collapse,” the scientists wrote.
Last week, another study said that three trillion tons of ice had thawed off from Antarctica since 1992, raising sea levels by almost a centimeter — a worsening trend.
It often takes thousands of years for the Earth’s crust to reshape after a loss of ice. Parts of Scandinavia or Alaska, for instance, are still rising since the end of the last Ice Age removed a blanket of ice more than a kilometer thick.
A further report this month found that the West Antarctic ice sheet expanded about 10,000 years ago, interrupting a long-term retreat after the last Ice Age, because of a rise of the land beneath.
But it said the process was too slow to save the ice sheet from a possible collapse triggered by global warming.
One of the lead authors of that study, Torsten Albrecht at the Potsdam Institute for Climate Impact Research, told Reuters on Thursday: “The expected eight-meter (26.4-foot) uplift in 100 years in the Amundsen Sea region ... seems rather small in order to prohibit future collapse.”