Elon Musk's behemoth rocket could help humans become a space-faring species
In August 2019, a prototype Starship, called Starhopper, lifted 500 feet into the air using a single Raptor engine and successfully descended.
Resupply missions to the International Space Station have helped SpaceX perfect in-space docking, a key component to orbital refueling.
Shutterstock
Fuel depots would allow Mars explorers to expand new communities across the planet.