Blue sky? | International Space Station

ESA Astronaut Alexander Gerst: "Johann Wolfgang von Goethe once said one does not need to travel around the world to understand that the sky is blue everywhere. I'm not so sure..."

Blauer Himmel?
"Um zu begreifen, daß der Himmel überall blau ist, braucht man nicht um die Welt zu reisen. (Johann Wolfgang von Goethe). Vielleicht doch...?"

Why is Earth's sky blue?
https://spaceplace.nasa.gov/blue-sky/en/

Follow Alexander and the Horizons mission:
http://bit.ly/AlexanderGerstESA and on bit.ly/HorizonsBlogESA

Credit: European Space Agency (ESA)/NASA–A. Gerst
Image Date: June 24, 2018

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