Focus Shifts to Space Data Centers

Space solar startup Aetherflux, co-founded by Robinhood's Baiju Bhatt, is reportedly nearing a deal to raise $250 million to $350 million in a Series B funding round. The investment would value the company at around $2 billion. Index Ventures is expected to lead the round, showing significant investor confidence. Aetherflux, founded in 2024, has already raised $60 million, including a $50 million Series A last year from firms like Breakthrough Energy Ventures and Andreessen Horowitz.

The company is pivoting from its original plan to transmit electricity to Earth via lasers. Instead, Aetherflux is focusing on developing power technology for orbital data centers, a move co-founder Bhatt humorously called a "non-travel" adjustment. This shift aligns with a growing industry trend toward putting computing power in space. Aetherflux plans to use solar energy captured in orbit to power these data centers, part of a vision for a "Galactic Brain" constellation to meet the rising energy needs of artificial intelligence. The company will still conduct laser power transmission tests using a satellite platform from Apex Space.

High Valuation in Nascent Market

Aetherflux's $2 billion valuation target comes as investors in space startups increasingly focus on proven revenue and clear economic models rather than just future growth. This ambitious valuation highlights strong interest in solving the vast compute needs of AI, which are straining power and land resources on Earth. Other companies are pursuing similar goals: Starcloud is developing orbital data centers and has trained AI models in orbit, having raised $21 million in seed funding. SpaceX, already a leader in space launch, also aims for orbital data centers and is reportedly preparing for a large IPO. Aetherflux's previous $60 million in funding places it among these emerging players in a costly industry.

Launching and Running Space Data Centers

The main hurdle for Aetherflux and others is making orbital computing economically viable compared to Earth-based systems. Launch costs are a major obstacle, with current prices around $1,400 to $2,500 per kilogram to orbit, much higher than the $200-$30 needed to compete. While SpaceX's reusable rockets are lowering costs, much more is needed for data center scale.

Orbital data centers also face complex engineering issues. Unlike Earth data centers that use air for cooling, space facilities must rely on radiation, creating significant thermal management problems. Components also need protection against space radiation, adding cost and complexity. Maintaining these systems in orbit further strains logistics and finances. Although space offers abundant solar energy, achieving efficient power generation and transmission is key.

Risks and Skepticism for Space Compute

The $2 billion valuation for Aetherflux's funding round depends heavily on future success, which carries significant risk. The company's move to space data centers taps into AI's huge demand for computing power but enters an unproven market. Some research suggests space compute costs could remain much higher than on Earth, even with optimistic forecasts.

Critics argue that the excitement around orbital data centers might stem more from "FOMO and aesthetic futurism" than solid business plans. The technical hurdles—from managing heat in space and protecting electronics from radiation to reliable power and in-orbit assembly—are substantial and require ongoing innovation. Aetherflux's target of launching its first data center satellite by 2027 is ambitious. Reaching cost parity with Earth facilities relies on future breakthroughs in launch tech and efficiency. Regulatory rules for space data and AI governance are also still developing, adding uncertainty. Intense competition from giants like SpaceX and Google means Aetherflux must clearly stand out and execute well.

Growth Potential and Funding Needs

The market for AI in space operations is expected to grow significantly, from an estimated $2.36 billion in 2025 to $15.05 billion by 2034. Companies like NVIDIA are developing advanced computing for space missions and partnering with players including Aetherflux. The space sector is increasingly driven by commercial ventures, with investment rising in technologies serving both defense and business markets.

Securing this Series B funding is vital for Aetherflux to advance its technology and work towards its 2027 satellite launch goal. Ultimately, its success will depend on mastering the economic and technical challenges to prove that space data centers can compete with terrestrial ones.