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20 Years of Changing Seasons on Earth Captured into 2½ Minutes by NASA

NASA captured 20 years of changing seasons in a striking new global map of the home planet that shows Earth's fluctuations as seen from space

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The Changing seasons of the Earth
The Changing seasons of the Earth has been captured by NASA. Wikimedia.

NASA captured 20 years of changing seasons on Earth in a striking new global map of the home planet.

The data visualization, released this week, shows Earth’s fluctuations as seen from space.

The polar ice caps and snow cover are shown ebbing and flowing with the seasons. The varying ocean shades of blue, green, red and purple depict the abundance — or lack — of undersea life.

“It’s like watching the Earth breathe. It’s really remarkable,” said NASA oceanographer Jeremy Werdell, who took part in the project.

Two decades — from September 1997 to this past September — are crunched into 2½ minutes of viewing.

Werdell finds the imagery mesmerizing. “It’s like all of my senses are being transported into space, and then you can compress time and rewind it, and just continually watch this kind of visualization,” he said Friday.

Werdell said the visualization shows spring coming earlier and autumn lasting longer in the Northern Hemisphere. Also noticeable to him is the receding of the Arctic ice caps over time — and, though less obvious, the Antarctic, too.

On the sea side, Werdell was struck by “this hugely productive bloom of biology” that exploded in the Pacific along the equator from 1997 to 1998 — when a water-warming El Nino merged into cooling La Nina. This algae bloom is evident by a line of bright green.

In considerably smaller Lake Erie, more and more contaminating algae blooms are apparent — appearing red and yellow.

All this data can provide resources for policymakers as well as commercial fishermen and many others, according to Werdell.

Programmer Alex Kekesi of NASA’s Goddard Space Flight Center in Maryland said it took three months to complete the visualization, using satellite imagery.

Just like our Earth, the visualization will continually change, officials said, as computer systems improve, new remote-sensing satellites are launched and more observations are made. (VOA)

Next Story

Koch to Set Record for Longest Spaceflight by Woman, Will Spend 328 Days in Space

"One month down. Ten to go," Koch wrote Wednesday on Twitter. "Privileged to contribute my best every single day of it"

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astronaut, longest spaceflight, record
FILE - In this April 8, 2019, photo made available by NASA, astronaut and Expedition 59 Flight Engineer Christina Koch works on U.S. spacesuits inside the Quest airlock of the International Space Station. VOA

A female astronaut is due to set a record for the longest spaceflight by a woman, the U.S. space agency said Wednesday, the same astronaut who was to have been in the first all-female spacewalk scrapped over lack of a right-sized spacesuit.

Astronaut Christina Koch, who completed the space walk with a man instead of a female colleague last month, will remain in orbit on board the International Space Station until February, the National Aeronautics and Space Administration (NASA) said.

Part of NASA’s study of the effects of long spaceflights on the human body, Koch will spend 328 days in space.

The 40-year-old astronaut has been in orbit since last month.

“One month down. Ten to go,” Koch wrote Wednesday on Twitter. “Privileged to contribute my best every single day of it.”

astronaut, longest flight
FILE – U.S. astronaut Christina Koch, member of the main crew of the expedition to the International Space Station (ISS), looks on prior the launch of Soyuz MS-12 space ship at the Russian leased Baikonur cosmodrome, Kazakhstan, March 14, 2019. VOA

In late March, NASA canceled what would have been the first all-female spacewalk with Koch and astronaut Anne McClain due to a lack of a spacesuit in the right size for McClain.

The walk was would have occurred during the final week of Women’s History Month.

On board the orbiting space station, astronauts work on a range of experiments in biology, biotechnology, health, earth, space and other sciences.

The typical stay for astronauts is six months, NASA said.

“NASA is looking to build on what we have learned with additional astronauts in space for more than 250 days,” Jennifer Fogarty, a chief scientist for NASA’s Human Research Program, said in a statement.

longest spacecraft, women
Part of NASA’s study of the effects of long spaceflights on the human body, Koch will spend 328 days in space. Pixabay

Record holders

Astronaut Peggy Whitson holds the record for the longest single spaceflight by a woman, staying in orbit 288 days in 2016 and 2017, NASA said.

“It’s my honor to follow in Peggy’s footsteps,” Koch said in a video from the International Space Station, orbiting over 200 miles (322 km) above Earth.

ALSO READ: SpaceX Launches Second Supersized ‘Falcon’ Heavy Rocket, For the First Time Lands all Three Boosters

Of the more than 500 people who have traveled to space, fewer than 11 percent have been women. But Koch graduated from NASA’s 2013 class of astronauts that was 50 percent women.

The overall NASA record of 340 days, set in 2016, is held by astronaut Scott Kelly in an experiment to compare his physical and mental health to his identical twin Mark Kelly, who remained on Earth. (VOA)