All five units for the first semester are bundled into one file at a discounted price. Units include:Unit I - "Introduction Into Astronomy"Unit II - "The Solar System"Unit III - "Planet Earth And The Moon"Unit IV - "The Inner Planets"Unit V - "The Outer Planets"Each unit contains many files with activities that include comprehensive PowerPoint lessons with up-to-date information and instructor slide sorter notes; graphics, short video links and a 20-question kahoot.it and quizziz.com interactive