Universe Sandbox is a physics-based space simulation software that allows users to create, destroy, and interact with celestial bodies in a virtual universe. It provides a realistic environment where users can manipulate gravity, collisions, and other cosmic phenomena to see how they affect the universe. The program features a variety of tools for exploring different scenarios, such as simulating the formation of solar systems or the impact of asteroids on planets. Users can also experiment with real astronomical data, making it an educational resource for understanding concepts in astronomy and physics.