What Would it Take For Us to Be Able to Travel Between The Planets in Our Solar System?

The Moon is three days away, and we reached it with four kilobytes of computer memory — yet in more than half a century, no human being has ever traveled farther. This is the full story of what actually stands between us and the planets: the equation that rules every rocket ever built, the engines we built and then buried, the quiet revolution unfolding in orbit this year, and the fuel waiting frozen in craters that haven't seen sunlight in two billion years. A two-hour journey through the chain of solvable problems separating us from the rest of the solar system. Dim the lights, settle in, and drift off among the planets. #space #astronomy #sleep #spacedocumentary #marsexploration #physics