Alternatives to Stellar Alpina

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

Develops electric propulsion solutions for satellites.

Developing green propulsion systems for space missions.

Designs and manufactures spacecraft solutions for government and commercial customers.

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

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

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

European private space ventures redefining independent orbital infrastructure.

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

NASA-inspired fire tech startup developing infrasound-based fire defense systems that detect and suppress fires without water or chemicals.

Specializes in plasma propulsion systems for spacecraft.

Developing space-based solar power technology.

A French aerospace startup developing sustainable aircraft.

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

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

A Spanish company developing small satellite launch vehicles.

Develops radiation shielding solutions for space.

ColibriTD is a DeepTech startup developing a quantum-powered multiphysics simulation platform for industrial applications.

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

European company developing orbital transport and re-entry vehicles.