These software are like open atlas to the vast universe and carry information about millions of objects out there. With these planetarium software, you can view Planets, Stars, Satellites, Galaxies, Deep space objects, Constellations, Nebulae, Asteroids, Comets, and much more. Some of these software simply take you to the object you want to view and have a 3 dimensional view. You can also manually set any location of Earth and set time in present, past, or future to view respective sky map. Most of these software simulate sky exactly for current position and time on Earth. These free software let you view and explore Space, right from your computer. Here is the list of Best Free Planetarium Software for Windows.