Water-Powered Spacecraft: Argo Space's Solar System Ambitions 2026

Water-powered spacecraft are gaining attention as a promising solution for deep space exploration. Three former SpaceX engineers have founded Argo Space to develop spacecraft that use water as propellant, aiming to cross the Solar System more affordably and sustainably.

Why Water Propulsion?

As space travel extends farther, the need for new propellants grows. While nuclear propulsion is being researched, water offers a logistically attractive alternative. It is ubiquitous throughout the Solar System, and can potentially be harvested from the Moon or asteroids, reducing reliance on Earth-based refueling.

Using water to propel spacecraft may seem unconventional, but sometimes the simplest solutions are the best. Argo Space's founders believe water's abundance and ease of handling make it a game-changer for long-duration missions.

The Argo Space Team

Brothers Robert, Ryan, and Kirby Carlisle are former SpaceX engineers who helped develop rockets at Elon Musk's company. When they founded their own company, they chose to focus on spacecraft rather than rockets, as spacecraft are significantly cheaper to develop and operate.

To further reduce costs and offer unique solutions, they decided to specialize solely in water-powered spacecraft. This niche focus allows them to innovate in a way that larger companies might overlook.

Advantages of Water as Propellant

• Ubiquity: Water is present throughout the Solar System, potentially reducing the need for Earth-based refueling.
• Cost-effectiveness: Water is cheaper and safer to handle than traditional propellants like hydrazine.
• Sustainability: In-situ resource utilization (ISRU) could allow spacecraft to refuel at destinations.
• Simplicity: Water propulsion systems may be simpler and more reliable.

How Water Propulsion Works

Water propulsion typically involves heating water to create steam, which is expelled through a nozzle to generate thrust. Alternatively, water can be split into hydrogen and oxygen through electrolysis, then used in a traditional chemical rocket engine. Argo Space likely employs one of these methods, though details remain proprietary.

The key advantage is that water can be stored safely for long periods and is non-toxic, unlike many conventional propellants.

Comparison of Propulsion Methods

While water propulsion has lower specific impulse than some alternatives, its logistical advantages may outweigh the performance gap for certain missions. The background to this story is set out in Matt Damon Founded Water.org After 2006 Zambia Trip. A related thread runs through Arts and Humanities Essential for Understanding Space Exploration. Earlier coverage in Arts and Humanities Play Key Role in Space Exploration shows how the argument developed.

Challenges and Future Outlook

Water propulsion faces challenges such as low thrust and the need for large tanks. However, for cargo missions or in-space transportation, these may be acceptable trade-offs. Argo Space's success will depend on proving the technology's reliability and cost-effectiveness. A closer look at the same subject appears in Science: latest articles. Anyone following the wider picture can start with The Moon's Spacecraft Graveyard: 70 Objects Left Behind. The same theme surfaces in SpaceX Satellite Launch Record: More Than All Humanity Combined, which takes a different angle.

As the space industry matures, innovative approaches like water propulsion could open new possibilities for exploration and commercialization. The Carlisle brothers' expertise from SpaceX positions them well to tackle these challenges. Context on how this played out before sits in Spain's First Electric Propulsion Satellite Reaches Orbit. A companion piece, Water-Powered Spacecraft: Argo Space's Solar System Ambitions, approaches the same subject from another angle.