Four new U.S. medium-lift rockets race to fill the void as SpaceX exits commercial launches

For the first time since 2013, the United States faces a real opportunity to develop a new fleet of medium-lift launch vehicles. Thirteen years have passed since Antares, a workhorse rocket relying on aging Soviet engines and Ukrainian manufacturing, became the last medium-lift platform to reach orbit. Now a wave of homegrown competitors threatens to reshape the commercial spaceflight landscape.

The catalyst is SpaceX's Falcon 9—scheduled to exit the commercial market by 2028. That departure creates both an urgent need and a market opening. Satellite operators face a critical planning crisis: the booking window from 2027 to 2030 is increasingly murky, as large rockets like Vulcan and New Glenn command steep prices and overbooked manifests. Nobody yet knows which of the incoming medium-lift rockets will achieve operational status or sustain reliable launch cadences.

A Generational Shift in Design Philosophy#

Unlike Antares, which outsourced engines and core manufacturing across continents, all four emerging vehicles pursue a lesson from SpaceX's playbook: vertical integration. Each company is building engines and critical hardware in-house to control costs, timelines, and supply chains. This homegrown approach represents a departure from Cold War-era dependencies and represents a maturing commercial space industry.

The Four Contenders#

Stoke Space: Nova

The most ambitious relative to its size, Nova targets a modest 3 tons in fully reusable mode but employs cutting-edge technology—full-flow staged combustion engines on the first stage and a novel heat shield for orbital-velocity reentry. Kent, Washington-based Stoke reports its first stage nearing completion, with the second stage already undergoing hot-fire testing at the launch site near Cape Canaveral. The company publicly committed to an "early 2027" debut, though a late-spring or summer launch is more plausible.

Predicted debut: July 2027

Relativity Space: Terran R

Technically exceeding the medium-lift classification with advertised capacity around 33.5 metric tons, Terran R shrinks closer to 20 tons with a reusable first stage. The Long Beach, California firm has surged since Eric Schmidt's acquisition eighteen months ago, breathing life into a previously stalled program. Recent milestones include completion of acceptance testing for all 13 Aeon R engines, first-stage structural qualification, and a successful integrated hot-fire test of the second stage last week. Despite impressive second-stage progress, Stoke retains an edge in launch-pad readiness.