While the Soviet Union may not have reached the Moon back at the height of the Cold War, they were certainly working on it. Here, meet the N-1, the brainchild of engineer Sergey Korolyov. The rocket and its four failed launches remained a state secret for decades.
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'We Were at War': 45 Years Since Apollo 9
Bezos Recovers Apollo F-1 Engines From Ocean Floor
The Apollo Rescue Mission That Wasn’t
The Mighty N-1: 30 Engines to Reach the Moon
The Mighty Saturn Rocket
Infographic: Saturn V's F-1 Engines
Apollo 11 Engines To Be Recovered
NASA Releases LRO High Res Pictures of Apollo Sites
How We Nearly Lost Discovery: Returning to Flight After Columbia
Remembering Columbia
Learning from Columbia
Organizational Factors of the Columbia Disaster
The Columbia Disaster and Space Program Safety 
Columbia And The Day of Remembrance
Sixteen Minutes from Home
STS-107: Columbia's Lost Crew
Timeline of the Columbia Disaster
Columbia Disaster Recommended Reading
Columbia Disaster Creative Works
The Columbia Disaster In Perspective![A trajectory analysis that used a computational fluid dynamics approach to determine the likely position and velocity histories of the foam (Credits: NASA Ref [1] p61).](http://www.spacesafetymagazine.com/wp-content/uploads/2014/05/fluid-dynamics-trajectory-analysis-50x50.jpg)
Cause and Consequences of the Columbia Disaster
Lessons Learned from the Columbia Disaster
Impact of Columbia Disaster on US Aviation SafetyLiving with Columbia: Interview with Mike Cianilli
Remembering the Columbia Crew, One Day at a Time
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