In-Space Mobility: Impulse Space's Chemical Propulsion Edge
Impulse Space, founded by rocket pioneer Tom Mueller, is carving a niche in the rapidly growing space economy by prioritizing speed over efficiency. Instead of relying on slow, electric propulsion for orbital maneuvers, the company uses chemical rockets to move satellites between orbits in a matter of hours.
"The focus is on in-space mobility, using chemical propulsion to move satellites between orbits faster than traditional electric systems."
Founded by former SpaceX engineer Tom Mueller, Impulse Space has raised over $1 billion and was valued at $4.3 billion as of early 2025. Mueller's personal net worth is estimated at $1.7 billion.
Two Spacecraft for Two Markets
Impulse Space has developed two distinct vehicles to serve different mission profiles:
- Mira: Designed for near-Earth missions, this spacecraft has already completed three flights. The first two were highly successful, including a record-setting 150-km orbit raise and a rendezvous with another satellite. The third mission encountered a technical problem with star trackers, leading to overcorrection and fuel depletion, though all satellite deployments were ultimately completed.
- Helios: Built for larger payloads bound for higher orbits. Helios is designed to move up to four tons from low-Earth orbit to geostationary orbit in under 24 hours. This is a dramatic improvement over the 6–12 months required by satellites using traditional electric propulsion.
Government Backing and Strategic Dependence
The company has secured nearly $400 million in contracts, predominantly from government sources including the U.S. Space Force and NASA.
Impulse Space's growth is tied to the broader expansion of the space economy and increased launch capacity. The company is notably dependent on the success of SpaceX's Starship rocket for launching its larger payloads, though Starship has faced several technical setbacks. However, Impulse President Eric Romo has stated the company is "prepared to succeed with or without Starship."
A Philosophy of Vertical Integration
Mueller has emphasized the importance of vertical integration for controlling cost, schedule, and quality.
"We aim for vertical integration to control cost, schedule, and quality."
He also pointed to Earth's limitations and potential resource depletion as a key driver for the space industry, stating the need for off-Earth resources.
When asked about the potential for competition from his former employer, SpaceX, Mueller expressed no concern, noting that priorities at SpaceX have shifted over time.