Tell me about game "kerbal space program".

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"Kerbal Space Program" (KSP) is a space flight simulation video game that was originally developed by Squad, a Mexican game developer. It was first released for Microsoft Windows, macOS, and Linux in April 2015, after being in early access for several years.

In Kerbal Space Program, players take control of their own space program operated by the Kerbals, which are small green humanoid aliens. The game features a realistic orbital physics engine, allowing for real-life orbital maneuvers such as Hohmann transfer orbits and bi-elliptical transfer orbits.

The primary mode of the game has the player engaging in building spacecraft, managing resources, and conducting missions. The spacecraft is constructed from a variety of parts that must be assembled to create a functional ship. These parts include engines, fuel tanks, control surfaces, and more. Each component affects the ship's performance, requiring the player to carefully consider the trade-offs when designing their missions.

The game has three primary modes:

1. **Sandbox Mode**: This mode gives players the freedom to create and fly any spacecraft they can imagine, with no specific goals or limitations.

2. **Science Mode**: Players conduct scientific experiments to research new technology and advance the knowledge of Kerbalkind. Through this progress, more advanced parts and technologies become available for spacecraft construction.

3. **Career Mode**: This mode combines the aspects of sandbox and science modes but also introduces management aspects. Players must manage aspects of the space program, including finances, reputation, and mission contracts.

Kerbal Space Program is known for its challenging gameplay, educational aspects, and the accurate physics simulation it offers, which makes it both a game and a learning tool for understanding the basics of rocket science and orbital mechanics. The game's community has been praised for its creativity and enthusiasm, with players sharing custom mods, spacecraft designs, and even complete missions.

KSP has been used in educational settings as well as by space professionals and enthusiasts. Moreover, it has had several updates and expansion packs that have added new features, improved the graphics, and expanded the gameplay.

Squad released the Making History expansion in 2018, which introduced a mission builder and historical missions. The second expansion, Breaking Ground, was released in 2019, focusing on planetary exploration, new science collection capabilities, and more advanced robotics parts.

As of my knowledge cutoff date in 2023, Kerbal Space Program 2 is also in development, promising to build upon the success of the first game with new features, improved graphics, and more expansive gameplay. The sequel aims to introduce interstellar travel, new celestial bodies, and a multiplayer feature, among other enhancements.