Sunday July 21, 2019
Home Science & Technology 20 Years of C...

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

0
//
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

Incredible Full Moon Falls on 50th Anniversary of NASA’s Apollo 11

The partial lunar eclipse will occur during the full moon beginning Tuesday night

0
Full Moon, Anniversary, NASA
The moon is seen during a lunar eclipse known as the "Super Blood Wolf Moon," in Manaus, Brazil, Jan. 21, 2019. VOA

The last lunar eclipse of the year will take place this week, allowing stargazers from large swathes of the globe to catch a glimpse of the celestial phenomena.

The partial lunar eclipse will occur during the full moon beginning Tuesday night, and will be visible in South America, Europe, Africa, Asia and Australia. The only region that will miss out on viewing the eclipse entirely is North America.

A lunar eclipse occurs when there is an alignment of the moon, the sun and the Earth. It can only happen during a full moon, because that is the only time the moon can be directly opposite of the sun in Earth’s sky.

The upcoming alignment will result in a partial lunar eclipse because the moon will be slightly askew from a direct line with Earth’s shadow.

Full Moon, Anniversary, NASA
The last lunar eclipse of the year will take place this week, allowing stargazers from large swathes of the globe to catch a glimpse of the celestial phenomena. Pixabay

This lunar eclipse will come two weeks after a total eclipse of the sun was visible over South America. This follows a typical astronomical pattern of lunar eclipses occurring within two weeks of a solar eclipse.

The last lunar eclipse took place in January 2019 and was visible from both Americas as well as parts of Europe and Africa. The next lunar eclipse will not take place until next year, however all four eclipses in 2020 will only be penumbral eclipses, which are much weaker than partial or full eclipses.

During penumbral eclipses, the moon passes through the weakest shadow cast by Earth and often does not visibly darken to the naked eye.

There won’t be another total lunar eclipse until May 2021.

Also Read- India Aborts Launch of Spacecraft Intended to Land on Far Side of Moon

Apollo anniversary

Tuesday’s lunar eclipse will be seen by stargazers at different times around the globe. Viewers in South America will be the first to see Earth’s shadow touch the moon’s surface when the moon is rising in the sky around sunset July 16, while watchers in Asia and Australia will see the moon in eclipse as it sets around sunrise July 17.

Interestingly, this celestial event falls on the anniversary of another lunar happening: July 16 is the 50th anniversary of the Apollo 11 rocket launch, which first landed humans on the moon. (VOA)