Video 5 Dec 20 notes

You’ve probably heard of The Blue Marble, an iconic photo of Earth captured in 1972 from 28,000 miles away by astronauts on the Apollo 17 spacecraft. Well, NASA has just released a number of photographs titled “Black Marble.” They offer the same perspective as the iconic photo, except these new images show what our planet looks like at night!

The photograph above shows North and South America (original resolution here). It’s a composite photograph created using images snapped by a satellite over the period of around three weeks in April and October of this year.

It took the satellite 312 orbits around our planet to capture 2.5 terabytes of imagery. The data was then mapped onto existing Blue Marble photographs to create Black Marble.

The satellite used a special new imaging system that can detect extremely dim signals. Scientists removed certain non-human-generated lights (e.g. gas flares, auroras, reflected moonlight) from the frame in order to have the photos only show artificial city lights (some wildfires remain, though).

 (via Black Marble: NASA Releases Incredibly Detailed Photos of Earth at Night)

#Black Marble #Earth #satellite image #NASA #night #skyglow #light pollution

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