NASA says its Dragonfly rotorcraft-lander mission has passed a critical design review, marking a major step toward sending the aircraft to Saturn’s moon Titan. The decision clears the project to enter its final development phase ahead of a planned launch in 2028.

Dragonfly is designed to study Titan’s chemistry and habitability by flying between different landing sites on the distant moon. Scientists hope the mission will help answer questions about how complex organic molecules evolve in environments unlike Earth.

The review is an important milestone because it confirms the mission’s technical plans, systems, and development approach are ready to move forward. NASA has described Dragonfly as one of its most ambitious planetary exploration projects, combining a drone-like design with in-situ science on an icy world.

If the mission stays on schedule, Dragonfly will eventually travel to Titan as part of a long-duration effort to examine one of the solar system’s most intriguing moons. For now, the approval signals that the project is progressing steadily toward launch.