Operator carefully mixes coolant for addition to cold trap in an all glass vacuum system in which gases evolved from… https://www.rawpixel.com/image/3325628/free-photo-image-scientist-chemistry-lab-researchFree Image from public domain licenseNASA astronaut Rick Mastracchio during EVA 2. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/440847/free-photo-image-nasa-astronaut-april-2010Free Image from public domain license