science
Startup raises $60 million claiming new particle can dim the Sun
Stardust Solutions says it has a scalable, low-cost aerosol for solar geoengineering but has not revealed the particle and is seeking regulators and governments as customers.
Apr 3rd 2026 · United States
Insights
- Israel-US firm Stardust Solutions raised $60 million to develop a proprietary aerosol particle for solar geoengineering.
- The company says the particle is scalable, low cost, and safe but has not disclosed its composition or independent test data.
- Scientists warn that aerosol-based cooling can cause known harms like acid rain and ozone damage and that long-term effects of new particles are unknown.
- Critics say a private company selling atmospheric interventions raises urgent transparency and governance questions for governments and publics.
- Previous geoengineering tests have sparked controversy and regulation, including a 2023 ban in Mexico and halted experiments at universities.
Sources
- UK Startup Ignites Plasma Inside Nuclear Fusion Rocket science.slashdot.org
- UL and IMR to design Ireland’s first 3D-printed liquid rocket engine www.siliconrepublic.com
- $60 Million Startup Says It’s Invented a New Particle to Dim the Sun futurism.com