Students and practitioners of the Science of Mind begin like any scientist with a curiosity, a question, study and do the research needed to bring them to a hypothesis, continue doing the research needed to determine for themselves the validity of the hypothesis, and ultimately build a foundation of faith in the hypothesis.
How do we "know" all that dark matter and dark energy exist at all? Well, it's precisely because astrophysicists know so much about how the regular matter operates.
Take a step back and think of where our society stands at this point in history. We’ve seen the industrial revolution, the automotive revolution, the electrical revolution and the computer revolution.