Relativity Space, the Long Beach startup known for 3D printed rockets, will design, build, and launch NASA's next Mars probe, carrying a four instrument suite called Aeolus that takes daily global measurements of Martian dust, clouds, winds, and temperatures.
NASA has spent decades building its own Mars orbiters from the ground up. Its next one will be someone else's.
Relativity Space, a Long Beach, California startup best known for 3D-printed rockets, will design, build, and launch NASA's next probe to the red planet, carrying a four-instrument suite called Aeolus that takes daily global measurements of Martian dust, clouds, winds, and temperatures. NASA Administrator Jared Isaacman announced the public-private partnership at Relativity's campus on June 17, 2026, with arrival at Mars targeted for 2028, according to Space.com's report on the announcement.
The science case is concrete. Existing Mars orbiters like MAVEN and Mars Reconnaissance Orbiter return atmospheric snapshots. Aeolus, NASA says, will be the first spacecraft to deliver daily global coverage of the Martian atmosphere, the kind of data scientists can plug into models that today run on fragments. Continuous measurements mean better forecasts of the planet-scale dust storms that have ended previous missions, sharper inputs for landing-site selection, and a clearer picture of how the thin Martian atmosphere cycles through seasons. NASA frames the return as lowering risk for future robotic and crewed surface missions.
The architectural shift matters more than the science alone. NASA is not buying a launch. It is buying a seat on a commercial Mars mission and retaining only the instrument suite. The bus, the rocket, and the mission operations belong to Relativity. That inversion, from mission integrator to payload tenant, is written into the agency's own language: pairing NASA instruments with commercial innovation while concentrating agency resources on science discovery, per Space.com's coverage of the announcement. Once the agency is an anchor tenant rather than a builder, every future Mars contract inherits commercial ecosystem economics: shared bus costs across customers, recurring data products, and weaker leverage on schedule.
That has tradeoffs. Relativity has flown small payloads to orbit but has not yet flown anything to Mars. A 2028 arrival leaves little margin for the deep-space qualification work and trajectory tweaks an interplanetary mission normally absorbs over years of slack. Cost-plus contracts carry institutional knowledge forward; commercial fixed-price contracts transfer that risk to the vendor. NASA has not published a redundancy plan if Relativity's Terran rocket family or its Mars trajectory slips. The agency's own framing, "more science, more often," assumes the commercial partner will keep pace.
The instrument suite itself is named Aeolus, sharing its name with a now-retired European Space Agency mission that mapped Earth's winds. NASA's Aeolus has four instruments: a Doppler wind and temperature sounder (DWTS-Ozone, built with GATS), a thermal limb sounder (TLS, built with Xiomas Technologies), and two additional atmospheric profilers. For a non-specialist reader, the relevant detail is that all four instruments are tuned to profile the lower and middle Martian atmosphere at the same time, the part of the sky where weather happens and where landing systems must operate.
The partnership lands as part of a broader NASA push to match agency payloads with commercial providers across deep space, not just low Earth orbit. Whether Aeolus actually arrives at Mars in 2028 will tell the agency whether the anchor-tenant architecture travels beyond Earth.