Artist concept illustrating the relative sizes of the one-man Mercury spacecraft, the two-man Gemini spacecraft, and the… https://www.rawpixel.com/image/441705/free-photo-image-space-illustration-astronomy-spaceshipFree Image from public domain licenseCutaway drawing of the North American X-15, a hypersonic rocket-powered aircraft operated by the United States Air Force and… https://www.rawpixel.com/image/441662/free-photo-image-rocket-nasa-cutawayFree Image from public domain license