TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Potential energy type of energy is possessed by autumn leaves before they fall.

SOLUTION: What type of energy is possessed by autumn leaves before they fall?

PROBLEM: Phospholipids are vesicles made of.

SOLUTION: What are vesicles made of?

PROBLEM: The voyager 1 spacecraft visited saturn in 1980.

SOLUTION:
What planet did the voyager 1 spacecraft visit in 1980?