Watch the ESA trace 2 million stars' journey across the skies
 

Carl Sagan showed how some constellations would change over time as stars move through the universe in his TV series Cosmos. Now the European Space Agency has done something similar, but in a much bigger scale: it has released a video showing 2 milli...

https://www.engadget.com/2017/04/15/...n-stars-video/