Total number of software in this category: 7
Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain and 3D buildings.
Stellarium is a free software planetarium, that show 3D photorealistic skies in real time.
Celestia is a free space simulation that lets you explore our universe in three dimensions.
WorldWide Telescope is freeware application that lets users explore the universe.
SkyChart is an atlas of cosmic objects that allows to get maps of the sky of stars.
Aladin is an interactive sky atlas that allows to look at and examine digitized astronomical photos.