This time-lapse video from the NACO instrument on ESO's Very Large Telescope in Chile shows stars orbiting the supermassive black hole that lies at the heart of the Milky Way over a period of nearly 20 years.
ESO/MPE
CC BY 4.0
<a rel="nofollow" class="external free" href="https://www.eso.org/public/videos/eso1825e/">https://www.eso.org/public/videos/eso1825e/</a>