Answer: How many solar systems are there in the universe.
Explanation:
You didn't given the options but based on further searches that I made online, I saw a similar question and choose the best option there.
A research question refers to a question which a research project sets out to answer. A good research questions should seek to improve the knowledge on a topic, and should be narrow and specific. The research question must be clearly defined as well.
"How many solar systems are there in the universe" isn't a good research question as it won't give a detailed analysis on the topic and doesn't improve knowledge on the topic.
