Nuclear satellites just went commercial — and it's a SpaceX thing

For decades, satellites have lived on solar panels. The more sunlight, the better. But when a satellite passes through Earth's shadow, or flies at high altitude where panels struggle, the batteries run down. Nuclear power fixes that — a radioactive source (usually plutonium-238) decays and gives off heat; a thermoelectric converter turns that heat into electricity. No moving parts. No sunlight needed. Lasts decades.

SpaceX just launched the first commercial satellite with this tech, and the reason it matters is timing. As more companies put satellites in higher orbits and in constellations that need to work 24/7 — think Starlink, but also Earth observation and comms for remote areas — the solar-panel constraint becomes real. A nuclear satellite doesn't care about the sun. It just works.

This is the kind of quiet infrastructure upgrade that doesn't get headlines but changes the economics of space. The hardware is proven (nuclear RTGs have flown on Voyager, Curiosity, Perseverance); what's new is the commercial supply chain and the price point.

Why this matters for us: the folks building out rural broadband and satellite comms are about to get a component that doesn't break when the weather turns — and that reliability is what makes space-based services actually viable for communities that can't afford ground towers.