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Take a Road Trip through Time with Landsat 9

A lot can change in five decades! How we talk, what we wear – it all evolves. But one thing that’s stayed consistent is our unique view of our home planet from above. Five decades ago, we at NASA partnered with United States Geological Survey (USGS) to launch a satellite called Landsat to see Earth from space. Now, we’re launching Landsat 9 – that’s right, the ninth in the series!

Join us for a road trip through the decades from the idea of an Earth-imaging satellite in the groovy 60s to the launch of Landsat 9 this year. Hop in!

The 60s

Far out! In 1966, USGS proposed a satellite to image land all around our planet. Researchers worked with our scientists and engineers to design the satellite and figure out how it would work.

The 70s

Here’s the lowdown: In 1970, we got approval to build the Earth Resources Technology Satellite, later renamed Landsat 1. The satellite launched in 1972 and provided the first digital data of Earth, repeated at regular intervals, which allows us to see changes as they happen.

The 80s

In 1982, we launched Landsat 4, followed by Landsat 5 in 1984. These two satellites collected more wavelengths of light at higher precision, allowing for natural color images, which is totally radical, dude.

The 90s

Wasssup, 1990s? Landsat 7 launched this decade, collecting even more data than previous Landsat satellites, enough to produce the first hi-res natural color map of remote Antarctica.

The 2000s

In 2008, our partners at USGS made all Landsat data available for free. This gave peeps around the world access to all the data they needed, unlocking innovation and creating economic benefits, like the ability to track crop health from space. Sweet!

The 2010s

In 2013, Landsat 8 began the modern era of Landsat observations. A new style of sensor and ground system made it possible to download much more and better data than ever before. Plus, a partnership with European Space Agency’s Sentinel-2 satellites gives even more regular observations. We heart that!

The 2020s

Now, we’re set to launch Landsat 9, a twin to Landsat 8. Two Landsat satellites with two instruments each will highkey change our view of Earth once again.

Now, on to the next 50 years of Earth observations! Stay tuned to watch Landsat 9 launch and start telling us even more about our home planet.

Make sure to follow us on Tumblr for your regular dose of space.

Free Online Language Courses

Here is a masterpost of MOOCs (massive open online courses) that are available, archived, or starting soon. I think they will help those that like to learn with a teacher or with videos.  You can always check the audit course or no certificate option so that you can learn for free.

American Sign Language

ASL University

Sign Language Structure, Learning, and Change

Arabic

Arabic Without Walls

Madinah Arabic

Moroccan Arabic

Armenian

Depi Hayk

Bengali

Learn Bangla (Register to see course)

Catalan

Parla.Cat

Speak Cat

Chinese (Mandarin)

Beginner

Chinese for Beginners

Chinese Characters for Beginners

Chinese for HSK 1

Chinese for HSK 2

Chinese for HSK 3 I & II

Chinese for HSK 4

Chinese for HSK 5

Mandarin Chinese Level I

Mandarin Chinese Essentials

Mandarin Chinese for Business

More Chinese for Beginners

Start Talking Mandarin Chinese

UT Gateway to Chinese

Intermediate

Intermediate Business Chinese

Intermediate Chinese Grammar

Mandarin for Intermediate Learners I

Dutch

Introduction to Dutch

English

Online Courses here

Resources Here

Faroese

Faroese Course

Finnish

A Taste of Finnish

French

Beginner

AP French Language and Culture

Elementary French I & II

Français Interactif

Vivre en France - A1

Vivre en France- A2

Intermediate & Advanced

French Intermediate course B1-B2

Passe-Partout

Travailler en France A2-B1                    

Vivre en France - B1  

German

Beginner

Deutsch im Blick

German Project

German at Work

Goethe Institute

Gwich’in

Introduction to Gwich’in Language

Hebrew

Biblical Hebrew

UT Austin

Hindi

A Door into Hindi

Virtual Hindi

Icelandic

Icelandic 1-5

Indonesian

Learn Indonesian

Irish

Irish 101, 102, 103, 104, 105, 106, 107

Italian

Beginner

Beginner’s Italian I

Introduction to Italian

Intermediate & Advanced

AP Italian Language and Culture

Intermediate Italian I

Advanced Italian I

Japanese

Genki

Japanese JOSHU

Japanese Pronunciation

Marugoto Courses

Tufs JpLang

Korean

Beginner

First Step Korean

How to Study Korean

Introduction to Korean

Learn to Speak Korean

Pathway to Spoken Korean

Intermediate

Intermediate Korean

Norwegian

Introduction to Norwegian I, Norwegian II

Norwegian on the Web

Persian

Easy Persian

PersianDee

Polish

Online Course

Portuguese

Pluralidades em Português Brasileiro

Russian

Beginner

A1 Course

I speak Russian

Intermediate

B1 Course

B1+ Course

B2.1 Course

B2.2 Course

Spanish

Beginner

AP Spanish Language & Culture

Basic Spanish I, Spanish II

Spanish for beginners  

Spanish for Beginners 1, 2, 3, 4, 5, 6

Spanish Vocabulary

Advanced

Corrección, Estilo y Variaciones 

Leer a Macondo

Swahili

Online Course

Turkish

Online Course

Ukrainian

Read Ukrainian

Speak Ukrainian

Welsh

Beginner’s Welsh

Discovering Wales

Yoruba

Yorùbá Yé Mi

Multiple Languages

Ancient Languages

More Language Learning Resources & Websites!

Last updated: May 2019

sometimes losing people makes u find urself

叶わないと知っているから遠くなるばかり。

The Sistine Ceiling

Within the vast complex of Vatican City, which is an independent city-state with its own governing body as well as the seat of the Pope in the Roman Catholic faith, is the famed Sistine Chapel (also known as the Venue of the Papal Conclave). The chapel is named after Pope Sixtus IV, who commissioned its restoration in the late 15th century. Originally, it was defined as the chapel of the Vatican fort, known as Cappella Magna. The chapel serves various important functions, from celebrating papal acts to ceremonies of the Catholic rite, but its major religious role is that of the site where cardinals meet to elect the next pope. The building where the Sistine chapel is located of the building very close to St. Peter’s Basilica and the Belvedere Courtyard in the Vatican.

The Sistine Chapel is also the home of 2 magnificent frescoes painted by the famed Michelangelo, the Sistine Ceiling (as it is known by) and later, The Last Judgement. There are also works from other notable Renaissance artists, from the likes of Sandro Botticelli, Pietro Perugino, Pinturicchio, Domenico Ghirlandaio, Cosimo Rosselli, and Luca Signorelli. The ceiling of the Sistine Chapel was originally painted blue and covered with golden stars (think of the ceiling of Sainte-Chapelle’s lower chapel). In 1508, Pope Julius II (1503-1513) commissioned Michelangelo to paint the ceiling of the chapel, instead of leaving it as it was. The pope wanted the ceiling done in a “ geometric ornament with the 12 apostles placed on spandrels around the decoration”. However, Michelangelo suggested that instead of doing ornamentation, he would do a painting of scenes from the Old Testament. Although, at the time, Michelangelo had been known more for his work in sculpture (as he had recently completed his famous sculpture of the Pietá as well as his statue of David, both of which reside in the Vatican) rather than painting. But, never one to be daunted, Michelangelo rose to the challenge and went on to create one of the most famous fresco masterpieces in Western art!

𐰸 Rendering of the Sistine chapel before Michelangelo worked his magic on it 𐰸

The ceiling of the chapel is made up of 33 separate areas, each space containing a different scene. Each scene is divided using a technique called trompe-l'oeil (visual deception, especially in paintings, in which objects are rendered in extremely fine detail emphasizing the illusion of tactile and spatial qualities), giving the impression that each painting is divided by physical molding within the vault. They are painted in monochromatic colors, creating a spatial effect between each panel. In the center of the ceiling is a series of nine narrative paintings, depicting scenes from the book of Genesis. There are five smaller scenes, each framed and supported by four naked youths or Ignudi. The scenes start with the Creation of the World (Gen. 1) and end with Noah and the Flood (Gen 6:9).

The subject matter was, more than likely, laid out with the help of a cleric from the Vatican (and seeing how this was the home of the pope, he wanted to be sure to get it right!) The entire project took Michelangelo 4 years to complete and took a grave toll on his health. He penned this poem, describing how his work was taxing both his body and mind:

I’ve grown a goiter by dwelling in this den– As cats from stagnant streams in Lombardy, Or in what other land they hap to be– Which drives the belly close beneath the chin: My beard turns up to heaven; my nape falls in, Fixed on my spine: my breast-bone visibly Grows like a harp: a rich embroidery Bedews my face from brush-drops thick and thin. My loins into my paunch like levers grind: My buttock like a crupper bears my weight; My feet unguided wander to and fro; In front my skin grows loose and long; behind, By bending it becomes more taut and strait; Crosswise I strain me like a Syrian bow: Whence false and quaint, I know, Must be the fruit of squinting brain and eye; For ill can aim the gun that bends awry. Come then, Giovanni, try To succor my dead pictures and my fame; Since foul I fare and painting is my shame.

The main theme of the frescoes is that of the connection between humans and God, and nowhere is this more evident than in the panel, The Creation of Adam. We are given a breathtaking vision of the spirit of God embodied as a human form, reaching across the heavens, just out of reach of Adam, who lazily reclines on a barren earth. This contact point has previously been described as a spark or current, an electrical metaphor which would be unknown to those in the sixteenth century. Nonetheless, it seems quite a fitting description, considering that the lifeblood which is about to flow into the awaiting Adam is similar to the flow of electric current produced when a wire is connected to a power source. In this case, the power source being God. This particular piece is world-famous and has been reproduced hundreds of thousands of times. And we can see why. It is such a powerful image.

At either end of the ceiling, and beneath the scenes are Prophets and Sibyls (a female prophet or witch, a nod to the pagan beginnings of religion) seated on grandiose thrones that alternate along the long sides, while the shorter sides are taken over by the figures of Zechariah and Jonah (situated above the altar) who has a distinguished position in so much as he is the adumbration of Christ. The crescent-shaped areas, or lunettes, above each of the chapel windows are tablets listing the forerunners of Christ and their accompanying figures. Above them, in the spandrels (the space between the shoulders of adjoining arches and the ceiling or molding above), eight groups of figures are displayed (however, they have not been identified with specific biblical characters). The entire narrative is finished off by four large corner pendentives (a curved triangle of vaulting formed by the intersection of a dome with its supporting arches) each one portraying a dramatic Biblical story. All of this illustrates the connections to Christ, before and after His birth and death, which are embodied in these paintings.

𐰸 map of the architectural features of the Sistine Ceiling 𐰸

𐰸 Guide to the artwork on Sistine Ceiling 𐰸

In 1510, Michelangelo decided that he needed a well-deserved break from this arduous assignment. Upon his return a year later, his style of painting had undergone a noticeable change. Rather than jumbled and multiple images within a scene, as previously done, Michelangelo had decided to minimise details and focus on essential figures, but on a grand scale. Also, he added a strong sense of emotion to the figures as well as dramatic gestures (as in The Creation of Adam). This would enable the viewer on the floor below to have a clear understanding of exactly what the scene was trying to convey. Further, when we look at the commanding figure of God in three of the frescoes, it clearly illustrates the separation of darkness from light, the creation of the heavens and the earth, all radiating its power through God’s body. The influence of these works cannot be emphasized enough. The complexity of design in the individual figures display Michelangelo’s skill in creating a variety of poses for the human figure. His stupendous works have turned the Sistine Chapel into a veritable academy for future artists!

Nicolas Geiser - Almost, 2015, stylo sur papier, 29,7 x 21 cm

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Stars Make Firework Supplies!

The next time you see fireworks, take a moment to celebrate the cosmic pyrotechnics that made them possible. From the oxygen and potassium that help fireworks burn to the aluminum that makes sparklers sparkle, most of the elements in the universe wouldn’t be here without stars.

From the time the universe was only a few minutes old until it was about 400 million years old, the cosmos was made of just hydrogen, helium and a teensy bit of lithium. It took some stellar activity to produce the rest of the elements!

Stars are element factories

Even after more than 13 billion years, the hydrogen and helium that formed soon after the big bang still make up over 90 percent of the atoms in the cosmos. Most of the other elements come from stars.

Stars began popping into the universe about 400 million years after the big bang. That sounds like a long time, but it’s only about 3% of the universe’s current age!

Our Nancy Grace Roman Space Telescope will study the universe’s early days to help us learn more about how we went from a hot, soupy sea of atoms to the bigger cosmic structures we see today. We know hydrogen and helium atoms gravitated together to form stars, where atoms could fuse together to make new elements, but we're not sure when it began happening. Roman will help us find out.

The central parts of atoms, called nuclei, are super antisocial – it takes a lot of heat and pressure to force them close together. Strong gravity in the fiery cores of the first stars provided just the right conditions for hydrogen and helium atoms to combine to form more elements and generate energy. The same process continues today in stars like our Sun and provides some special firework supplies.

Carbon makes fireworks explode, helps launch them into the sky, and is even an ingredient in the “black snakes” that seem to grow out of tiny pellets. Fireworks glow pink with help from the element lithium. Both of these elements are created by average, Sun-like stars as they cycle from normal stars to red giants to white dwarfs.

Eventually stars release their elements into the cosmos, where they can be recycled into later generations of stars and planets. Sometimes they encounter cosmic rays, which are nuclei that have been boosted to high speed by the most energetic events in the universe. When cosmic rays collide with atoms, the impact can break them apart, forming simpler elements. That’s how we get boron, which can make fireworks green, and beryllium, which can make them silver or white!

Since massive stars have even stronger gravity in their cores, they can fuse more elements – all the way up to iron. (The process stops there because instead of producing energy, fusing iron is so hard to do that it uses up energy.)

That means the sodium that makes fireworks yellow, the aluminum that produces silver sparks (like in sparklers), and even the oxygen that helps fireworks ignite were all first made in stars, too! A lot of these more complex elements that we take for granted are actually pretty rare throughout the cosmos, adding up to less than 10 percent of the atoms in the universe combined!

Fusion in stars only got us through iron on the periodic table, so where do the rest of our elements come from? It’s what happens next in massive stars that produces some of the even more exotic elements.

Dying stars make elements too!

Once a star many times the Sun’s mass burns through its fuel, gravity is no longer held in check, and its core collapses under its own weight. There, atoms are crushed extremely close together – and they don’t like that! Eventually it reaches a breaking point and the star explodes as a brilliant supernova. Talk about fireworks! These exploding stars make elements like copper, which makes fireworks blue, and zinc, which creates a smoky effect.

Something similar can happen when a white dwarf star – the small, dense core left behind after a Sun-like star runs out of fuel – steals material from a neighboring star. These white dwarfs can explode as supernovae too, spewing elements like the calcium that makes fireworks orange into the cosmos.

When stars collide

White dwarfs aren’t the only “dead” stars that can shower their surroundings with new elements. Stars that are too massive to leave behind white dwarfs but not massive enough to create black holes end up as neutron stars.

If two of these extremely dense stellar skeletons collide, they can produce all kinds of elements, including the barium that makes fireworks bright green and the antimony that creates a glitter effect. Reading this on a phone or computer? You can thank crashing dead stars for some of the metals that make up your device, too!

As for most of the remaining elements we know of, we've only seen them in labs on Earth so far.

Sounds like we’ve got it all figured out, right? But there are still lots of open questions. Our Roman Space Telescope will help us learn more about how elements were created and distributed throughout galaxies. That’s important because the right materials had to come together to form the air we breathe, our bodies, the planet we live on, and yes – even fireworks!

So when you’re watching fireworks, think about their cosmic origins!

Learn more about the Roman Space Telescope at: https://roman.gsfc.nasa.gov/

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

For Earth Day, we’re inviting you to take a moment to celebrate our wonderful water world, Earth. As far as we know, our Blue Marble is the only place in the universe with life, and that life depends on water. Snap a photo of yourself outside and tag it #GlobalSelfie – bonus points if your selfie features your favorite body of water! http://go.nasa.gov/3xFt0H0

Make sure to follow us on Tumblr for your regular dose of space!