Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Example Input: Question: What is the touch response in plants called? Answer: thigmotropism
Example Output: The surface temperature of most stars is due to their size. Bigger stars produce more energy, so their surfaces are hotter. But some very small stars are very hot. Some very big stars are cool.

Example Input: Question: The term "vapor" refers to the gas phase when it exists at a temperature below what? Answer: boiling temperature
Example Output: for low temperatures, where the phase can change from a gas to a liquid. The term "vapor" refers to the gas phase when it exists at a temperature below the boiling temperature.

Example Input: Question: What is the outer core made of? Answer: liquid metal
Example Output:
Yes! The outer core, anyway. The outer core is liquid metal, like in this photo. Of course, the metal is under an incredible amount of pressure.