You should target your submissions to a "peer audience"; that is, to an individual with your academic background, interest and experience but who has not yet taken this course.
While the concept of exoplanets orbiting other stars is now well founded from observations, there is increasing discussion about planets "roaming" between the stars, so called rogue planets. What evidence exists for such planets, how many are speculated to exist and what challenges would life experience in existing on such planets.