1950s-70s USA and Russia philatelic covers that are related to the early satellites development, manned and unmanned spaceflights to the moon.
1961-11-18 USA Ranger 2
Launched on 18 November 1961, Ranger 2, like Ranger 1, was designed as a test vehicle. The spacecraft's engines failed to re-ignite after the spacecraft entered a low earth orbit. The spacecraft burned up in earth's atmosphere just two days after launch.