DARK MATTER

CERN turned back on its collider and resumed its search for
Dark matter  a hypothetical kind of matter that cannot be seen with telescopes but accounts for most of the matter in the Universe.
BBC R4 M Bragg In our time today's subject DARK MATTER 
so I took the challenge as a change from dereliction.
lens used today is Minolta RF 250mm f5.6 catadioptric