Dragonfly is an upcoming NASA mission to send a robotic rotorcraft to the surface of Titan, the largest moon of Saturn. It is to be launched in July 2028 and arrive in 2034, becoming the first aircraft on Titan. Built to study prebiotic chemistry and extraterrestrial habitability, it is intended to make the first powered and fully controlled atmospheric flight on any natural satellite. It will then use its vertical takeoffs and landings (VTOL) capability to move between exploration sites. Its main mission will last for around three years and could cover 115 km (70 miles) from its original landing site; visiting and landing at 20-30 sites.
Titan is the only extraterrestrial body in the Solar System with an abundant, complex, and diverse carbon-rich chemistry and a surface dominated by water ice, with an interior water ocean, making it a high-priority target for astrobiology and origin-of-life studies. The mission was proposed in April 2017 to NASA's New Frontiers program by the Johns Hopkins Applied Physics Laboratory (APL), and was selected as one of two finalists (out of twelve proposals) in December 2017 to further refine the mission's concept. On 27 June 2019, Dragonfly was selected to become the fourth New Frontiers mission. In April 2024, the mission was confirmed and moved to its final development stages.
Overview
Dragonfly is an astrobiology mission to Titan to assess its microbial habitability and study its prebiotic chemistry at various locations. Dragonfly is designed to perform controlled flights and vertical takeoffs and landings between locations. The mission is to make flights to multiple locations on the surface, which allows sampling of diverse regions and geological contexts.
Titan is a compelling astrobiology target because its surface contains abundant complex carbon-rich chemistry and because both liquid water (transient) and liquid hydrocarbons can occur on its surface, possibly forming a prebiotic primordial soup.
A successful flight of Dragonfly would make it the second rotorcraft to fly on a celestial body other than Earth. The first was Ingenuity, an uncrewed helicopter that landed on Mars with the Perseverance rover on 18 February 2021 as part of the Mars 2020 mission and first achieved powered flight on 19 April 2021.
History
The initial Dragonfly conception took place over a dinner conversation between scientists Jason W. Barnes of Department of Physics, University of Idaho, (who had previously made the AVIATR proposal for a Titan aircraft) and Ralph Lorenz of Johns Hopkins University Applied Physics Laboratory, and it took 15 months to make it a detailed mission proposal. The principal investigator is Elizabeth Turtle, a planetary scientist at the Johns Hopkins Applied Physics Laboratory.
The Dragonfly mission builds on several earlier studies of Titan mobile aerial exploration, including the 2007 Titan Explorer Flagship study, which advocated a Montgolfier balloon for regional exploration, and AVIATR, an airplane concept considered for the Discovery program. The concept of a rotorcraft lander that flew on battery power, recharged during the eight-Earth-day Titan night from a radioisotope power source, was proposed by Lorenz in 2000. More recent discussion has included a 2014 Titan rotorcraft study by Larry Matthies, at the Jet Propulsion Laboratory, that would have a small rotorcraft deployed from a lander or a balloon. The hot-air balloon concepts would have used the heat from a radioisotope thermoelectric generator (RTG).
Dragonfly is to use its multi-rotor vehicle to transport its instrument suite to multiple locations to make measurements of surface composition, atmospheric conditions, and geologic processes.
Dragonfly and CAESAR, a comet sample return mission to 67P/Churyumov–Gerasimenko, were the two finalists for the New Frontiers program Mission 4, and on 27 June 2019, NASA selected Dragonfly for development with a plan to launch in June 2027.
On 3 March 2023, Dragonfly passed its preliminary design review (PDR). In November 2023 following NASA's decision to postpone the formal confirmation of the mission due to funding uncertainties, the launch was delayed by one year, with a new launch date set for July 2028. On 25 November 2024, NASA announced the launch service award for the Dragonfly mission. Dragonfly will launch on a SpaceX Falcon Heavy with a targeted launch period from 5 July 2028, to 25 July 2028.
On 25 April 2025, Dragonfly passed its critical design review phase which marks the beginning of the full-scale physical construction and testing of the probe.
During the 2025 federal government shutdown, NASA's Goddard Space Flight Center began closing multiple buildings and consolidating equipment, which the agency describes as a pre-planned “strategic consolidation” not expected to impact missions. A NASA spokesperson told CNN that work on the Nancy Grace Roman Space Telescope and the Dragonfly mission would continue during the shutdown as excepted operations.
According to Space.com, some employees at the center expressed concern that the manner and timing of the closures could disrupt work on those projects, and CNN reported that an internal document compiled by Goddard staff cited potential impacts on specialized testing laboratories.
Construction of the spacecraft began on 10 March 2026.
On June 1, 2026, the Dragonfly design and test team announced that thermal-structural testing of the entry probe's heat shield had been completed in the desert of New Mexico using Sandia's Solar Tower, a test facility that uses hundreds of calibrated mirror-like systems to focus the Sun's energy onto the test heat shield unit. The test heat shield successfully withstood the extreme heat, even though defects had been intentionally introduced into the unit. In the same announcement, the team also reported that it had recently measured the signal patterns emitted by Dragonfly's high-gain antenna (HGA) in an APL test chamber designed to simulate space environment.
On 29 June, the Dragonfly mission reached a major development milestone when the mission team at the Johns Hopkins Applied Physics Laboratory (APL) delivered the spacecraft's nearly fuselage for the next phase of integration ahead of schedule. The delivery followed approximately one month of structural testing of the lander frame assembly, which includes the landing skids, the cover for the spacecraft's radioisotope power system, and the arms that will support Dragonfly's eight rotor assemblies.
Following the completion of structural testing, integration of the spacecraft's mechanical, thermal, and electrical systems began on 1 July. During this phase, engineers installed the flight bulkheads, wiring harnesses, cables, and electrical connectors within the fuselage. Additional avionics, electronic subsystems, and scientific instruments were scheduled to be integrated after completion of their assembly and testing by the mission's partner institutions.
During vibration testing, mass simulators were installed in place of the flight instruments and electronics, which were undergoing assembly and testing at other facilities. For the ground vibration test, the rotorcraft structure was suspended several centimeters above the ground using long bungee cords, allowing engineers to measure how vibrations generated at the rotor attachment points propagated through the airframe to critical sensors. According to the mission team, suspending the vehicle in this manner provided a structural configuration comparable to that expected during Dragonfly's first flight. The vibration campaign also included a "sit-down" configuration, in which the lander was lowered onto protective padding and rested on its landing skids while engineers measured the structural response expected during surface operations on Titan.
Funding The CAESAR and Dragonfly missions received US$4 million funding each through the end of 2018 to further develop and mature their concepts. NASA announced the selection of Dragonfly on 27 June 2019, which is expected to be built and launched by July 2028. Dragonfly is the fourth in NASA's New Frontiers portfolio, a series of principal investigator-led planetary science investigations that fall under a development cost cap of approximately US$850 million, and including launch services, the total cost projection is approximately US$1 billion. A revised cost projection was released in April 2024, with Dragonfly now expected to incur a total lifecycle cost of US$3.35 billion due to supply chain increases and delays caused by the COVID-19 pandemic.
Science objectives
Titan is similar to the very early Earth and can provide clues to how life may have arisen on Earth. In 2005, the European Space Agency's Huygens lander acquired some atmospheric and surface measurements on Titan, detecting tholins, which are a mix of various types of hydrocarbons (organic compounds) in the atmosphere and on the surface. Because Titan's atmosphere obscures the surface at many wavelengths, the specific compositions of solid hydrocarbon materials on Titan's surface remain essentially unknown. Measuring the compositions of materials in different geologic settings is intended to reveal how far prebiotic chemistry has progressed in environments that provide known key ingredients for life, such as pyrimidines (bases used to encode information in DNA) and amino acids, the building blocks of proteins.
Areas of particular interest are sites where extraterrestrial liquid water in impact melt or potential cryovolcanic flows may have interacted with the abundant organic compounds. Dragonfly would provide the capability to explore diverse locations to characterize the habitability of Titan's environment, investigate how far prebiotic chemistry has progressed, and search for biosignatures indicative of life based on water as solvent and even hypothetical types of biochemistry.
The atmosphere contains plentiful nitrogen and methane, and strong evidence indicates that liquid methane exists on the surface. Evidence also indicates the presence of liquid water and ammonia under the surface, which may be delivered to the surface by cryovolcanic activity.
Design and construction
Dragonfly is designed as a rotorcraft lander, much like a large quadcopter with double rotors, which is known as an octocopter. The rotor configuration provides redundancy to enable the mission to tolerate the loss of at least one rotor or motor. Each of the craft's eight rotors is in diameter. The aircraft would travel at about and climb to an altitude of up to . The craft is designed to operate in a space radiation environment and in temperatures averaging .
Flight on Titan is aerodynamically benign. Titan's low gravity and its dense atmosphere's paucity of wind permits unimpeded and efficient rotor propulsion. The power needed to achieve flight for a given mass is about 40 times lower than that required on Earth. The atmosphere possesses 1.45 times the pressure and about 4 times the density of Earth's, and when combined with a local gravity only 13.8% of Earth's, flight becomes an order of magnitude easier to sustain. Despite these advantages Titan's cold temperatures, lower light levels and higher atmospheric drag on the airframe will all present challenges.
Dragonfly should be able to fly several kilometers, powered by a lithium-ion battery, which is to be recharged by a Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) during the night. MMRTGs convert the heat from the natural decay of a radioisotope into electricity. Twenty-four Radioisotope Heater Units (RHUs) are also kept reserved for this mission. The rotorcraft should be able to travel on each battery charge and stay aloft for a half hour each time. The vehicle is to have sensors to scout new science targets, and then return to the original site until new landing destinations are approved by mission controllers.