For a heartbeat, there was silence. They were coasting.

The Apollo program ended, and NASA shifted to the Space Shuttle. The F-1A and J-2X engines were tested but never flew.

Far above the atmosphere, inside the claustrophobic confines of the Command Module Endeavor , Commander Jack Kincaid felt the vibration more than he heard it.

"Roll program," called out the capsule communicator, or CAPCOM, his voice cutting through the static from Houston.

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