Now, I’m not going to write a post answering that question. Instead, I invite you to explore that on your own and I’m talking about Habitable Worlds online course. It’s going to be launched soon.
HabWorlds is a powerful adaptive learning platform with scientifically accurate simulations and informative lectures, and will allow you to experience science beyond dry observations and facts.
What I like about the idea here is that the course is organized around the Drake Equation and puts together stars, planets, habitability, life, intelligence, technology, and sustainability. (Not to mention that I really enjoyed the music from this video.)