Happy # DarkMatterDay ! I will share some fare today relevant to this day. Enjoy the mystery of the unidentified matter that has shaped the # cosmos . Maybe you will even want to become engaged in solving the # mystery . There are no easy answers on the constituents of dark matter. Easy stuff was done long ago. :-) https://chirp.cooleysekula.net/attachment/11abb096c3e02dbe038a450f3c9fa9d994ba911c83c0a8f685b275a4bd5d3f17/view