could you help me polish up my writing? thank you.

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I have written a passage for my students which will be a model writting. English is not my native language, so I will appreciate it if you help me polish it up. Thank you, my friends in mylot. ----------------------------------- Dear Nicolaus Copernicus, I am a student absorbed in your books about solar system for years. I heard that you have a new discovery in this area I hope you can share with us bu publishing it courageously. First, the problems with the present theory are obvious because the brightness of some stars seems to change if the earth was the centre of the universe. So I see why the way the planets move is not hwat your would expect. Most important, never can science move forward if people keep their achievements in the dark. On the other hand, with your theory, people won't be blinded for long time. Above all, just as the saying goes that time tries all, I am convinced that your ideas will be accepted by all. So I hope you can publish your new theory. Yours, ...