Astronaut Mark C. Lee floats freely as he tests the new Simplified Aid for EVA Rescue (SAFER) system. Original from NASA.… https://www.rawpixel.com/image/441338/free-photo-image-astronaut-nasa-spaceFree Image from public domain licenseAstronaut Mark C. Lee (right) floats freely as he continues to test the new Simplified Aid for EVA Rescue (SAFER) system… https://www.rawpixel.com/image/441340/free-photo-image-astronaut-nasa-universeFree Image from public domain license