Every year on May 4th we put our Westerbork telescopes into mourning mode, to remember all the victims who fought for our freedom. Watch the video that we made a couple of years ago in cooperation with @kampwesterbork, demonstrating this. #4mei #Memorial

Our radio telescopes don't need the darkness to function, but they do need quiet skies, free from radio interference. This month is Dark and Quiet Skies month. What can you do to keep our skies dark and quiet?
https://www.iau.org/public/darkskiesawareness/
#DarkAndQuietSkies