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You are able to buy "America's Secret Space Heroes" on Apple TV as download.
There are no options to watch America's Secret Space Heroes for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when show is available to watch for free on streaming services and TV.
The inside stories of how the unknown engineers of NASA created such superior machines as the Saturn V moon rocket, the Space Shuttle, and the Hubble Space Telescope, often against incredible odds.