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How NASA’s Apollo 8 Left Earth’s Orbit

Discover how Apollo 8 used trans-lunar injection to become the first manned mission to orbit and return from the Moon.

Publish Date: Topic: Space + FlightSpace & FlightNova

Eleven-and-a-half minutes after leaving the ground, Apollo 8 is circling the Earth at 17,000 miles an hour. Then, an unprecedented and momentous event: the third stage engine re-lights and sends Apollo 8 out of Earth orbit toward the Moon. It’s a daring maneuver NASA calls T.L.I., or “trans-lunar injection.”

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