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Science

Fact: NASA takes the best before-and-after photos. Here are 10 of them.

Our world is changing every day.

via NASA

Setiment in Louisiana


NASA satellites continually monitor the Earth, snapping photos and sending information to researchers on the ground.

Most of the time, things seem to be more or less the same as they were the day before, but the Earth is actually constantly changing. Sometimes it changes through discrete events, like landslides and floods. Other times, long-term trends, such as climate change, slowly reshape the land in ways that are difficult to see.

By zooming way out, we can get a new perspective of the events that have changed the Earth. These 10 before-and-after photos show the disasters, trends, and changes that have affected our planet, as seen from space.

1. In May 2016, NASA's satellites picked up the devastating 2016 Fort McMurray wildfire.

Before:

2016, forest, satellite images

Satellite image from before the wildfire.

All images from NASA.

After:

wildfire, nature, global warming

Satellite image after the devastating fire.

All images from NASA.

In May 2016, a wildfire broke out near Fort McMurray in Alberta, Canada. It destroyed more than 2,400 homes and businesses and burned through roughly 1,500,000 acres of land before it was under control. (Some of the pictures use false-color imaging to distinguish between land types, by the way).

2. The satellites also captured how landscapes eventually recover from fires, like in Yellowstone.

Before:

Yellowstone, camping, national parks

Satellite image after fire in Yellowstone.

All images from NASA.

After:

plains, recovery, satellite images, California, state parks

Nature returns to normal with time.

All images from NASA.

In 1988, wildfires burned through over a third of Yellowstone National Park. 28 years later, images show that much of the forest and plains have returned.

3. They saw drought shrink Utah's Great Salt Lake over the last 30 years ...

Before:

Utah, salt lake, drought,

Image of the Utah’s Great Salt Lake before the drought.

All images from NASA.

After:

climate change, water supplies, Great Salt Lake

Water supplies have shrunk with a possible link to climate change.

All images from NASA.

Persistent drought has shrunk water supplies throughout much of the West. Scientists now think this may be linked to climate change.

4. And they showed the Mississippi pouring over its banks in March 2016.

Before:

Mississippi Delta, floods, displacement,

Satellite image of the Mississippi Delta and river.

All images from NASA.

After:

record-breaking rain, precipitation, river banks

Rivers overflow their banks with spring run offs.

All images from NASA.

Record-breaking rain inundated much of the Mississippi Delta in the spring of 2016, causing the mighty river to spill over its banks.

5. In West Virginia, surface mining reshaped mountaintops.

Before:

mountains, surface mining, land damage, capitalism

West Virginia before surface mining.

All images from NASA.

After:

resources, coal, West Virginia, ecology

West Virginia after surfacing mining for coal.

All images from NASA.

Mountaintop mining is often used to search for coal and can have lasting effects on the land.

6. In Washington state, the Oso mudslide changed the Earth back in 2014.

Before:

Washington state, mudslides, earth

Mudslides can create significant change to an environment.

All images from NASA.

After:

landslide, environmental catastrophe, deaths, NASA

A landslide reshapes a community and kills 43 people in Washington state.

All images from NASA.

43 people were killed in the March 2014 landslide in western Washington.

7. In Louisiana, sediment carried by water created new land.

Before:

topography, geology, geography

Water carries sediment which changes the topography.

All images from NASA.

After:

sediment, coastline, rive

Sediment can create new land.

All images from NASA.

Rivers and streams often carry sediment with them. As they slow down and reach the coast, that sediment falls out of the water. Over time, this can create new land, as you can see above.

8. The images show Hurricane Isaac touching down in Louisiana.

Before:

hurricanes, state of emergency, Hurricane Isaac

Satellite image before the hurricane.

All images from NASA.

After:

Louisiana, devastation, gulf coast, flooding

Image of the flooding of Louisiana after the hurricane.

All images from NASA.

Hurricane Isaac hit the gulf coast in August 2012. 41 people lost their lives and more than $2 billion worth of damage occurred. Above you can see the flooding that still lingered afterward.

9. And warming temperatures shrink Alaska's Columbia Glacier.

Before:

Alaska, glaciers, global warming

Alaska’s Columbia Glacier as seen from satellite.

All images from NASA.

After:

Columbia Glacier, climate crisis, climate change

Warmer global temperatures have shrunk many glaciers.

All images from NASA.

Over the last 28 years, warmer global temperatures have shrunk many glaciers, including Alaska's Columbia Glacier. From above, the shrinkage is crystal clear.

10. Meanwhile, our cities grew and expanded, like this image of San Antonio, Texas, shows.

Before:

Texas, expansion, San Antonio, population

The growing community of San Antonio, Texas.

All images from NASA.

After:

Alamo, Spurs basketball, environmental impact

The city has started to take up more space than the natural environment.

All images from NASA.

San Antonio — home of the Alamo and the Spurs basketball team — had a population of just over 1 million people in 1991. Today, it's added another 400,000 people.

The above images are only a small set of the many pictures NASA released. Globally, there were a ton of other interesting sites, like entire lakes turning red in Iran, new islands being formed by ocean volcanoes, and dams flooding rainforests in Brazil.

The world — and our country — is constantly changing, and we play a part in that.

Sometimes nature changes us, such as people having to respond to floodwaters, but we also know humans affect the Earth as well. And while it's true that the Earth has gone through natural cycles, we know it's now happening faster than ever before.

As the Earth will continue to change, it's important to remain aware of how we affect the Earth — and how the Earth affects us.


This article originally appeared on 01.23.17

From Your Site Articles
science
Education

You may not know Gladys West, but her calculations revolutionized navigation.

She couldn't have imagined how much her calculations would affect the world.

US Air Force/Wikimedia Commons.

Dr. Gladys West is inducted into the Air Force Space and Missile Pioneers Hall of Fame, 2018.

This article originally appeared on 02.08.18


If you've never driven your car into a lake, thank Gladys West.

She is one of the mathematicians responsible for developing the global positioning system, better known as GPS.

Like many of the black women responsible for American achievements in math and science, West isn't exactly a household name. But after she mentioned her contribution in a biography she wrote for a sorority function, her community turned their attention to this local "hidden figure."

West was one of only four black employees at the Naval Proving Ground in 1956.

She accepted a position at the Dahlgren, Virginia, facility doing calculations, with her early work focusing on satellites. West also programmed early computers and examined the information that determined the precise location and elevation of satellites in space. Her data collection and calculations would ultimately aid in the development of GPS.

Employe testing the circuits on a super computer 1950s.

U.S. Census Bureau employees/Wikimedia Commons.

West and her colleagues back then probably could not have speculated just how much their calculations would affect the world.

Pretty much every "smart" device — from cellphones to fridges to dog collars — has GPS capabilities these days. The technology has changed the way we play, work, navigate, and explore our communities.

"When you're working every day, you're not thinking, 'What impact is this going to have on the world?' You're thinking, 'I've got to get this right,'" West once said in an interview with The Associated Press.

GPS, technology, community, inventors

GPS has intrigated into many of the devices we use today.

Photo by Psk Slayer on Unsplash

West would continue her work until her retirement in 1998.

After more than 40 years of calculations and complex data analysis, West retired. And following a well-earned vacation with her husband, she suffered a major stroke. But during her recovery, she worked toward returning to school and earned a doctorate. Her go-forward determination led to her regain most of her mobility, and she even survived heart surgery and cancer years later.

While she may not be as well known as other women in STEM fields, West's contribution is undeniable.

At 87, West is working on her memoir and spending time with her husband, children, and grandchildren. And according to her oldest daughter, West — despite the advent of GPS — still likes to have a paper map on hand.

Who are we to argue with greatness?

From Your Site Articles
Joy

'Moon bloopers' from NASA is the space footage we didn't know we needed

Apparently, walking on the moon is harder than it looks.

"... Apollo mission" by x-ray delta one is licensed under CC BY-NC-SA 2.0.

Astronauts falling on the moon is some stellar entertainment.

When Neil Armstrong became the first human to set foot on the moon on July 20, 1969, the story of life on Earth was dramatically and forever changed. No longer were we bound to the land on our own planet. We had set foot on another orb in space, broken a new frontier, literally going where no man had gone before.

The words, "That's one small step for man, one giant leap for mankind," spoke to the technological advances that had catapulted the human race from the first sustained, powered human flight to landing a man on the moon in less than 70 years. It was truly an incredible feat.

That "one small step," that people around the world watched on their television sets was seriously momentous. But the steps the world didn't see were genuinely hilarious.

NASA has footage of astronauts trying to walk around on the moon's low gravity, zero atmosphere surface, and apparently, it's a lot harder than it looks. The graceful bouncing of astronauts we've seen in moon landing films belies how easy it was to fall and trip. And once you fall down in a huge space suit in gravity conditions your body isn't used to, it's not so easy to get back up again.

Universal Curiosity shared a montage of "moon bloopers," if you will, sped up 2x for optimal comedic effect. Watch these brilliant space scientists stumble Three Stooges-style as they make their way around the moon:

Eight of the 12 astronauts who have walked on the moon shared recollections of their time on the moon with Forbes in 2019. Nearly across the board, they talked about having a keen understanding of the historic nature of their moon missions, but also being totally focused on the checklists of what they needed to do while they were there. Each Apollo moon mission was limited by time, so there wasn't a lot of opportunity to just goof around.

Some astronaut falls were accidental, including one that nearly cost astronaut Charlie Duke his life during the Apollo 16 mission. While jumping up and down on the moon to see how high he could go—not part of the mission—Duke lost his balance and fell backward onto his fiberglass shell backpack. Thankfully, it didn't crack, but it was a deadly possibility that would have left him without life support and victim to the vacuum of space.

Other falls were planned experiments to see how the conditions on the moon affected human locomotion, providing valuable information for scientists. Still hilarious to watch, though.

This Dark5 documentary segment shares more details about why walking on the moon is such a challenge and the actually quite serious stories behind some of these falls:

From Your Site Articles
Identity

See how NASA describes stunning Webb telescope images for people who can't see them

Their alt text descriptions are stellar.

NASA/Twitter

Webb telescope images come with wonderfully detailed alt text descriptions.

When the first images of space came back from the high-powered James Webb Space Telescope on July 12, 2022, it felt like the whole world stopped for a moment to marvel. Never before have we seen such an intricate look at what's out there, and the detail was stunning. Since then, we've seen a steady stream of visual wonders far beyond our solar system, delighting our eyes and tickling our imaginations.

But what about those who aren't able to see them? Do people who are visually impaired simply miss out on the joy of "seeing" these gorgeous glimpses of our universe?

Nope. NASA has made sure that these images are accessible to all and has done a stellar job of it. The alt text descriptions of the Webb telescope images are truly wonderful, giving not only visual descriptions but additional details that all of us can benefit from.

For instance, here's a recent alt text description from one of the Webb telescope images:

"A dramatic blade made of red gaseous wisps comes down top-to-bottom in the center of the image as smaller green wisps feather out in horizontal directions. A bright star shrouded in blue light is near the center of the bow-like blade. Blue dots in different sizes dot the background of the image, signifying neighboring stars."⁣

And here's the image it's describing:

Or check out this image of the Cartwheel Galaxy and the way the alt text describes it.

"Image Description: A large galaxy on the right, with two much smaller companion galaxies to the left at 10 o’clock and 9 o’clock. The large galaxy resembles a speckled wheel, with an oval outer ring and a small, off-center inner ring. The outer ring contains pink plumes like wheel spokes, with dusty blue regions in between. The pink areas are silicate dust, while the blue areas are pockets of young stars and hydrocarbon dust. The inner ring is smoother, filled in with a more uniform pale pink. This smaller ring is interwoven with thin, orange-pink threads. On the galaxy's right edge, a bright white star with 8 diffraction spikes shines. The two companion galaxies to the left, one above the other, are about the same size and both spiral galaxies. The galaxy above is a reverse S shape but similar in coloring and texture as the large ring galaxy. The galaxy below is smoother and largely white, with a blue tinge. The background is black and full of more distant, orange-red colored galaxies of various sizes."

Alt text is often brief and concise, offering enough description to get a general idea of what an image is but not a ton of detail. Such brevity is helpful in certain contexts, but not when you're describing awe-inspiring pictures of the deep universe.

According to an article by Theresa Vargas in The Washington Post, the descriptions come from a team of writers, designers, educators and scientists at the Space Telescope Science Institute in Baltimore.

“It’s been really heartening to see how much this has touched people,” Tim Rhue II, principal informal education specialist at the institute, told the Post. “It’s something that’s deeply personal to so many people. On top of that, we do it because we want to make astronomy accessible to everyone. It’s astronomy and dinosaurs that are gateways to science for so many people.”

In an interview with NPR, Rhue described creating the alt text descriptions as "a labor of love."

"Space is for everyone," he said. "It shouldn't matter who you are."

NASA's alt text descriptions not only make the images accessible to everyone, but they make the science of the images more accessible for everyone. Even those without visual impairments can appreciate reading the scientific detail of what makes certain colors or shapes in the images. The team at the Space Telescope Science Institute goes out of its way to include lots of detail, going beyond simple surface descriptions. It matters, and it's being noticed by people of all abilities.

Thank you, NASA, for illustrating the fact that when we embrace greater accessibility, we all win.

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