This video is from the John J. McCarthy Observatory in New Milford, CT. The monthly astronomy lecture is done by Bob Lambert. The lecture starts with an explanation that we are now living in the Earth’s Secondary Atmosphere. It also discusses the First Atmosphere called the primary atmosphere and did not resemble today’s atmosphere at all. The presenter discusses the gases that were contained in the first atmosphere and gases contained in the atmosphere today. The presenter stands beside a screen with a Power Point presentation. Run time 09:58.