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December 20, 2021
- Terra Sabaea – False Color
- 55 Years Ago: Two Months Until Apollo 1
- Blueprints of the James Webb Space Telescope
- NASA Volunteer Crew Soon to Begin Simulated Journey to a Mars Moon
- Driven to Mars – S4E1
- NASA, Partners Approve Axiom Mission 1 Crew
- December 20, 1968
- South Sudan Submerged
- NASA Administrator Helps Review Time Capsule Items