Below are the minimum and recommended PC requirements to play Kerbal Space Program:
Minimum Requirements
OS: Windows Vista SP1, macOS Mavericks (10.9), Ubuntu 14.04 LTS
Processor: Core 2 Duo
Memory: 3GB RAM
Graphics: DX10 (SM 4.0) capable, 512MB VRAM
Hard Drive: 4 GB HD space
Recommended Requirements
OS: Windows 10 64 bit, macOS Sierra (10.12), Ubuntu 16.04 LTS
Processor: Core i5
Memory: 4 GB RAM
Graphics: DX10 (SM 4.0) capable, 1GB VRAM
Hard Drive: 6 GB HD space