Watch Online Free HD Solarmovies. Critical Path offers an exclusive, behind-the-scenes look at the engineering marvel that is the SpaceX Starship program. The documentary details the iterative design philosophy, the high-stakes testing, and the relentless drive to build the largest and most powerful rocket ever flown. From the first conceptual sketches to the atmospheric re-entry and landing attempts, this film chronicles the single, complex path of innovation required to make life multi-planetary.