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: Hardness, density, color, and melting and boiling points are all considered what types of properties? Answer: physical
Example Output: Physical properties include color, density, hardness, and melting and boiling points.

Example Input: Question: What is the the force of attraction that holds together ions? Answer: ionic bond
Example Output: An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element.

Example Input: Question: Approximately how many galaxies are there in the universe? Answer: about a hundred billion
Example Output:
The Universe contains about a hundred billion galaxies.