Liquid Oxygen Loading Begins

Valves are opening and cryogenic liquid oxygen is about to begin flowing into the Delta II rocket’s first stage.

After tanking, the occasional puff of gaseous oxygen will be visible outside the rocket’s midsection throughout the remainder of the countdown. This is normal; as the liquid oxygen warms, small amounts of it will boil off and vent away. The tank will be topped off until shortly before liftoff.

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