Four instruments. That is all NASA needs, it believes, to fundamentally change what humanity knows about the Martian sky. In a selection that surprised parts of the aerospace industry, the agency has chosen Relativity Space — a company better known for a rocket that failed shortly after launch than for any mission success — to carry its Aeolus atmospheric science payload to Mars in 2028. The announcement, which was first reported by TechCrunch, signals a striking shift in how NASA is willing to buy access to deep space.

Under the terms of the new public-private partnership, Relativity Space will be responsible for the spacecraft, the rocket, and all cruise operations required to deliver Aeolus into Martian orbit. Once there, the payload's four scientific instruments are designed to produce what NASA describes as the first integrated, daily, global picture of Martian winds, temperatures, dust, and clouds. That data matters far beyond pure science: NASA says it will directly inform the entry, descent, and landing systems that any future crewed mission would depend on. In other words, before astronauts can safely reach the Martian surface, a small robotic weather station will need to map the invisible forces that could kill them.

The company tasked with delivering it has had a turbulent recent history.