When choosing a topic for your astronomy research paper, it is important to select something that interests you and that is feasible to research within the given time and resources. You should also consider the availability of sources and data, as well as whether your topic is current and relevant to the field of astronomy. Some ideas for finding a topic include brainstorming your own interests and ideas, consulting with your instructor or supervisor, or looking through recent astronomy research papers to see what topics are being studied currently.