[ExI] Black Hole - How they did it documentary video.

[BillK]

BBC TV has a 1 hour video documentary showing how they linked all the
telescopes and got the black hole picture. They had a lot of problems
over the years to build the system. Worth watching.

<https://www.youtube.com/watch?v=8xg5pznPcX0>
or
<https://www.youtube.com/watch?v=i0jBr9CossE>

If that doesn't work in your country, try -
<https://mirror.cat/tXSl5Xu>

If these don't work try a search for-    how-to-see-a-black-hole

BillK