Writing is a key skill for everyone, especially for scientists. No scientific investigation is complete until it becomes known to the world, and scientists do this by writing papers and publishing them. There have been too many important scientific discoveries that were ignored for years because the scientists who first did the work had not done a good job of writing up the results in a way that people could understand. Since I take this so seriously, and since they were so good last semester in SPS 1010, I will personally read and grade every one. Having something to say in your paper is important, of course, and how you write it is important, too.
Good content is so much easier to understand if it's written in a way that's easy to understand.
For hints on writing, see The Elements of Style, by W. B. Strunk and E. B. White. These papers may be on any topic in contemporary or historical space science, space exploration, space engineering, solar or space physics, planetary science, remote sensing, astronomy, or astrophysics. There must be a reference list, in a format that I can use to look up the sources, since I hope your papers will be interesting. Five hundred to 750 words isn't much. It will help to focus on a specific topic.