NASA has formally ended its OSIRIS-REx mission, the pioneering asteroid-sampling effort that delivered pristine material from the near-Earth asteroid Bennu to Earth. The mission's conclusion marks the close of a seven-year journey that scientists say has transformed understanding of the early solar system and the building blocks of life.
Launched in September 2016, OSIRIS-REx traveled to Bennu, a carbon-rich asteroid that orbits relatively close to Earth. After arriving in December 2018, the spacecraft spent nearly two years mapping the asteroid's surface in unprecedented detail before executing a dramatic touch-and-go sample collection in October 2020. The spacecraft then began its long return journey, delivering the sample capsule to the Utah desert in September 2023.
The returned material, estimated at about 121.6 grams, represents the largest asteroid sample ever brought to Earth and the first from a carbonaceous asteroid. Early analysis has already revealed the presence of water-bearing minerals and organic molecules, offering clues about how water and prebiotic chemistry may have been delivered to the early Earth. Scientists around the world are continuing to study the samples, which are expected to yield discoveries for decades.
«I am immensely proud of what we did,» said Dante Lauretta, the mission's principal investigator, reflecting on the team's achievement. The mission's success has been hailed as a testament to international collaboration and engineering ingenuity, involving partners including NASA's Goddard Space Flight Center, the University of Arizona, and Lockheed Martin.
With the mission now officially closed, the focus shifts to the scientific legacy of OSIRIS-REx. The sample material is being curated at NASA's Johnson Space Center in Houston, where portions are being distributed to research teams worldwide. The mission also left behind a wealth of data about Bennu's composition, shape, and orbital dynamics, which could inform future asteroid mining and planetary defense efforts.
OSIRIS-REx's conclusion comes as NASA and other space agencies ramp up efforts to explore small bodies. The European Space Agency's Hera mission is en route to the Didymos system to study the aftermath of NASA's DART impact, while Japan's Hayabusa2 has already returned samples from asteroid Ryugu. Together, these missions are building a comparative picture of asteroid diversity and the role of these objects in shaping habitable worlds.
For the OSIRIS-REx team, the end of the mission is bittersweet but filled with pride. The spacecraft itself, now on an extended mission dubbed OSIRIS-APEX, is heading toward the asteroid Apophis for a 2029 rendezvous, ensuring that the mission's legacy of discovery continues well into the next decade.