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Kosmos 300
Kosmos 300 Mission to Earth's Moon

Goals: This was the third Soviet attempt to bring samples of lunar soil back to Earth.

Accomplishments: None. The spacecraft reached Earth orbit, but the booster failed to fire as needed to send the probe to the Moon. About four days after launch, it reentered Earth's atmosphere.


Key Dates
23 Sep 1969:  Launch
Status: Unsuccessful
Fast Facts
Kosmos 300 Facts Two previous Soviet efforts in the summer of 1969 also failed to collect samples from the Moon.

An investigation found a stuck fuel-injection valve marooned the spacecraft in Earth orbit.

The Soviets referred gave the spacecraft a Kosmos designation, which implied it was meant to remain in Earth orbit instead of going to the Moon.
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Last Updated: 29 Nov 2010