Here's a sneak-peek of the cell that will support the secondary mirror of ESO's Extremely Large #Telecope.

This mirror is 4.25 m wide, the largest optical secondary mirror ever on a telescope. Heck, it's even larger than the *primary* mirror of many current telescopes!

This cell was made by Sener in #Spain.

https://www.youtube.com/watch?v=hsNK91XZ8HA

#astrodon #astronomy #technology