NASA’s Osiris-REx spacecraft is slated to deliver a significant asteroid sample to Earth on Sunday, marking a momentous occasion for space exploration and our understanding of the early solar system.

Launched in September 2016, the Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (Osiris-REx) mission aimed to visit the near-Earth asteroid Bennu, survey its surface, collect samples, and return them to Earth for detailed analysis. The goal was to learn more about the building blocks of our solar system and potentially to uncover clues about the origin of life on Earth.

Bennu is a particularly intriguing target for such a mission. It’s classified as a B-type asteroid, which means it contains carbon and various other minerals that scientists believe could have been precursors to life on Earth. The study of Bennu and its material could give insights into the chemistry that led to the origin of life.

After reaching Bennu in December 2018, Osiris-REx scanned and mapped the entire surface of the asteroid in detail, searching for an ideal location from which to take a sample. In October 2020, it descended toward Bennu’s surface in an intricate maneuver known as Touch-And-Go (TAG), during which it extended an arm to touch the surface for a few seconds and used a burst of nitrogen gas to unsettle and collect samples from the regolith.

The mission has been highly successful despite challenges posed by Bennu’s rougher-than-expected terrain. Osiris-REx was able to collect a substantial amount of material—far more than the 60 grams minimum required for the mission’s success—fully securing its collection capsule.

With this precious cargo aboard, Osiris-REx began its return journey to Earth in May 2021. The spacecraft’s sample-return capsule is expected to re-enter Earth’s atmosphere on Sunday before parachuting down to the Utah Test and Training Range. Once recovered by scientists, it will be transported to NASA’s Johnson Space Center where it will be carefully opened in a clean room designed specifically for handling extraterrestrial material.

The significance of Osiris-REx’s delivery cannot be understated. This will be the first time NASA has returned an asteroid sample since the Apollo era when moon rocks were brought back by astronauts. The Osiris-REx mission stands as a testament not just to human ingenuity but also to international collaboration; several countries have contributed to both equipment and research efforts associated with the mission.

As we await eagerly for Sunday’s historic delivery, anticipation builds in the scientific community. The asteroid samples could revolutionize our understanding of our place in the cosmos and provide essential data for potential asteroid mining endeavors that might one day become crucial should Earth’s resources become increasingly scarce.

Indeed, this celestial delivery may open doors not only into our past but also forge pathways into our future explorations beyond this world.