Chester Astronomical Society is one of the world's oldest scientific societies going back to 1892.
It hosts public lectures by amateurs and professionals alike and arranges visits to sites of technical interest.
Yesterday's meeting saw a superb lecture by Dr. Phil James (Liverpool John Moores University)
on "Galaxies and Dark Matter". He outlined the case for dark matter and considered the possibilities of what it might be. He also looked at alternative possibilities and their strengths and weaknesses. A very clear and interesting presentation.