Stars Orbiting Galactic Center


 
That short video is the result of a 16 year effort to map the orbits of several stars near the center of our galaxy (The Milky Way). The actual stars move much slower than this (32 million times slower, according to the description of the video).
 
Below is a longer video that offers a full explanation of how the astronomers did this, and what they think is going on at the center of our galaxy.
 

 

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