Space Engine is a free, open-world space simulation software that allows users to explore a vast universe filled with procedurally generated stars, planets, and galaxies. It provides a realistic representation of celestial bodies and their physical properties, enabling users to travel through space at various speeds, including faster-than-light travel. The software features a user-friendly interface and supports various viewing modes, including first-person and third-person perspectives. Users can create and customize their own spacecraft, as well as observe astronomical phenomena like black holes, supernovae, and nebulae, making it an educational tool for astronomy enthusiasts and gamers alike.