I'm a couple weeks into a couple coursera courses. Two more start later this year.
The one I care most about is 'Imagining Other Earths', which is about astronomy, planetary science and biology regarding the origin of life and some other stuff. It ends at the end of this year.
The final project is to create a solar system and write a couple of pages about it. That's why I decided to take it.
>"In the final paper, students will have an opportunity to invent their own planetary system and describe it in terms of either the astronomy of how it was discovered, the properties of their planet and its host star, or the biology of life in the system."I don't think it's too late to join if anyone's interested:
https://class.coursera.org/otherearths-002