See below, large LP exhibit at the Natural history museum, Washington DC, in case not already known Mario The Smithsonian Museum of Natural History has a rather large exhibit focused on light pollution. There is a long summary of the exhibit at https://naturalhistory.si.edu/explore/story-map/lights-out There are lots of examples where you can use a slider to see the difference between good and bad lighting and the impact of light pollution. I thought the exhibit was very well done. While we were there, there were lots of visitors. Hopefully the message gets out. This is somewhat old news since the exhibit opened last March. Michael Toups You have received this message as a member of: Amateur Telescope Makers of Boston Change preferences (including opt-out): Online Profile <https://www.atmob.org/content.aspx?page_id=13&club_id=71141>. Click on 'Forum Memberships' to change your settings for this forum, or 'Forum General Preferences' for all forums.