Alternatives to Stellar Alpina

Japanese space tech startup developing hybrid rocket propulsion systems for satellite, launch, defense, and security applications.

Develops innovative, iodine-fueled electric propulsion systems for small satellites.

Develops electric propulsion solutions for satellites.

Designs and manufactures spacecraft solutions for government and commercial customers.

Operating the world's only commercial fleet of flight-ready MACH 2+ supersonic aircraft for space launch.

Developing reusable spacecraft to manufacture pharmaceuticals and high-end materials in microgravity for Earth use.

Building a space-based economy with a reusable spaceplane and orbital destinations.

European private space ventures redefining independent orbital infrastructure.

Indian rocket startup preparing for the country's first private orbital launch.

Specializes in plasma propulsion systems for spacecraft.

Developing space-based solar power technology.

A French aerospace startup developing sustainable aircraft.

Specializes in propulsion systems for small satellites.

Building satellites for very low Earth orbit (VLEO) to advance global connectivity and insight.

A Spanish company developing small satellite launch vehicles.

Provider of space domain awareness, intelligence, and advanced missile defense technology solutions.

Develops radiation shielding solutions for space.

Develops electrospray propulsion systems for satellites.

Operates the world’s largest autonomous airship fleet for persistent intelligence, surveillance, and reconnaissance (ISR) capabilities.