The bottom section of a rocket with multiple sections, that lifts the mass of the entire loaded rocket off the ground and accelerates it through the lower atmosphere. Once its fuel is spent, it separates from the rocket and falls, and the next section - the second or upper stage - ignites to complete the journey to orbit.

The bottom section of a rocket with multiple sections, that lifts the mass of the entire loaded rocket off the ground and accelerates it through the lower atmosphere. Once its fuel is spent, it separates from the rocket and falls, and the next section - the second or upper stage - ignites to complete the journey to orbit.

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