Muon Space

Muon Space was founded in 2021 in Mountain View, California by Jonny Dyer, Dan McCleese, Paul Day, Reuben Rohrschneider, and Pascal Stang to build full-stack, mission-optimized satellite constellations rather than generic buses. Its standardized Halo satellite platform underpins custom Earth-observation missions for climate, defense, and science customers. Muon's highest-profile program is FireSat, an early-wildfire-detection constellation developed with Google Research and the nonprofit Earth Fire Alliance, whose protoflight satellite returned its first wildfire images in 2025. The company raised a Series B that grew to roughly $146 million, including a $56.7 million tranche led by Activate Capital in 2024 and an $89.5 million extension in 2025 that also funded a propulsion-startup acquisition.