Image Sources

Filename: as11-44-6552~orig.jpg
Source: NASA Image Archives

Filename: SKorolow.jpg
Source: Horyzonty Techniki

Filename: Wernher_von_Braun_1960.jpg
Source: Marshall Space Flight Center, NASA

Filename: Sputnik_asm.jpg
Source: NSSDC, NASA

Filename: Explorer1.jpg
Source: NASA

Filename: gagarin.jpg
Source: ESA

Filename: f0002-01.jpg
Source: NASA

Filename: f0011-03.jpg
Source: NASA