...150-minute window that opens at 8 a.m. Eastern on Monday, April 17. Standing at nearly 400 feet tall, Starship is made of gleaming stainless steel, an unusual choice in a business where every pound of weight matters. SpaceX started out looking at advanced, lightweight composites for Starship...steel was cheap, abundant, and most importantly, incredibly tough. It could hold cryogenic rocket fuel and tolerate the grueling heat of re-entry better than other materials. The rocket also uses an unconventional fuel choice – methane. Most high-powered rockets use hydrogen for fuel because it is lightweight and highly efficient... ...methane does have some...