Robert, Ryan, and Kirby Carlisle are three engineers who worked at SpaceX during the Falcon 9 era, seeing the revolution in the global launch industry from the inside.

The brothers launched rockets, refurbished rockets, and sold rockets. But when it came time for them to leave SpaceX and start their own space company—a lifetime dream for the Carlisle brothers—they chose not to build rockets. Rather, they focused on spacecraft.

In late 2022, the three Carlisles founded Argo Space to build infrastructure in space. Their vision was not just in-space transportation but also removing the need to use propellants from Earth to move around the heavens. They chose water, which is potentially harvestable on the Moon and found all over the Solar System, as a means of propulsion.

“We based the company on water,” Robert Carlisle said in an interview.

The availability of water is key to the company’s vision for building a transportation network between low-Earth orbit, geostationary orbit, and the Moon.…