Total number of software in this category: 5
Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain and 3D buildings.
Earth Alerts is a free application for the real-time tracking of current natural hazard events all over the world.
Stellarium is a free software planetarium, that show 3D photorealistic skies in real time.
WorldWide Telescope is freeware application that lets users explore the universe.
Celestia is a free space simulation that lets you explore our universe in three dimensions.