Today 50 years ago the most powerful rocket ever built - Saturn V - launched first astronauts to set foot on the Moon. But right now the leading NewSpace companyis building even more powerful rocket for Mars - Starship & Super Heavy . SpaceX is hoping it to be operational in 2021.Here is a poster bywith Saturn V and SpaceX Starship at launch pad. Note the Starship is at front so it appears a lot bigger than Saturn V at back. In reality the difference in height is minimal with Saturn V being 111 m high and Starship & Super Heavy at 118 m by current design which is subject to change.