Tess swaps the marble for a bigger gray ball.

A bigger gray ball in the marble's place.

Does the model have every part the system needs? Yes: the gray ball stands for the Moon, so every part is there.

Then Tess stands a toy rocket beside the model.

A toy rocket beside the model.

Does the model have every part the system needs? Yes, the rocket is an extra thing, and an extra thing changes nothing.

The seven cases under the question: a tick for every model that has every part, a cross for the two that have a part missing.