Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: The Sun is made almost entirely of the elements hydrogen and helium. The Sun has no solid material. Most atoms in the Sun exist as plasma . Plasma is superheated gas with an electrical charge. Because the Sun is made of gases, it does not have a defined outer boundary. Like Earth, the Sun has an internal structure. The inner three layers make up what we would actually call "the Sun. ". Answer: hydrogen and helium
A:
What two elements primarily make up the sun?