Relativity Space has shipped the second stage of its Terran R heavy-lift launch vehicle to NASA's Stennis Space Center, marking a critical step toward a planned 2026 debut. The move signals that the company is advancing beyond manufacturing into integrated vehicle testing for the fully reusable rocket.
The Terran R second stage will undergo a full-duration static fire test at Stennis, validating its methane-oxygen propulsion system. Relativity has not disclosed the engine count for the upper stage, but the vehicle is designed to deliver up to 33,000 kilograms to low Earth orbit. The first stage will use seven Aeon R engines, each producing roughly 77,000 pounds of thrust.
Relativity Space has not announced an exact target month for the maiden flight, but the company has previously indicated a 2026 goal. The timeline follows years of development and a pivot from the smaller Terran 1, which flew once in 2023. The Stennis test campaign is expected to run several months, with additional hardware deliveries likely later this year.
Terran R represents a bet on large-scale 3D printing and rapid iteration in rocket manufacturing. If successful, it would compete with SpaceX's Falcon 9 and Falcon Heavy, as well as Blue Origin's New Glenn, in the medium-to-heavy launch market. Relativity has secured launch contracts for the vehicle but has not disclosed pricing or customer manifest details.
The company has not released a total development cost estimate for Terran R. Industry observers note that achieving reusability on a new architecture carries significant technical risk, and the 2026 timeline may slip based on test outcomes and funding.