NASA’s OSIRIS-REx mission, which successfully returned a sample from the near-Earth asteroid Bennu in 2023, has provided significant new insights into both the asteroid’s composition and the broader workings of the universe.
While the primary focus of the mission was to collect and analyze material from Bennu, scientists are now using the data to explore new avenues of research, including the potential existence of a fifth fundamental force in the universe. This research could challenge current models of physics and expand our understanding of dark matter, gravity, and the formation of the solar system.
Bennu Tracking and the Quest for a Fifth Fundamental Force
One of the most intriguing outcomes of the OSIRIS-REx mission is its unexpected contribution to the field of fundamental physics. By analyzing the precise tracking data from Bennu’s orbit, scientists have been able to probe whether a fifth fundamental force exists, alongside the four known forces: gravity, electromagnetism, and the strong and weak nuclear forces. This research aims to provide evidence that might extend the Standard Model of physics, a theoretical framework that has successfully explained much of what we know about the universe, but still leaves many questions unanswered—particularly about dark matter and dark energy.
Researchers from Los Alamos National Laboratory and other institutions are examining Bennu’s orbital trajectory for subtle anomalies that could suggest the existence of a fifth force. By studying these small deviations, scientists hope to detect the presence of new particles, such as ultralight bosons, which may mediate this additional force. Yu-Dai Tsai, lead researcher on the project, emphasized the importance of this work, stating, “Interpreting the data we see from tracking Bennu has the potential to add to our understanding of the theoretical underpinnings of the universe, potentially revamping our understanding of the Standard Model of physics, gravity, and dark matter.” If successful, this research could have far-reaching implications for our understanding of how the universe operates at its most fundamental levels.
Bennu’s tracking data, gathered during the mission, has provided an unprecedented level of precision in understanding its orbital path. This information allowed researchers to impose some of the tightest constraints yet on the existence of a potential fifth force. As Sunny Vagnozzi, co-author and assistant professor at University of Trento, explained, “The tight constraints we’ve achieved translate readily to some of the tightest-ever limits on Yukawa-type fifth forces. These results highlight the potential for asteroid tracking as a valuable tool in the search for ultralight bosons, dark matter, and several well-motivated extensions of the Standard Model.” The study represents a new frontier in how we can use celestial objects like asteroids to probe fundamental physics.
Bennu’s Composition: Clues to The Origins of Life
While the mission’s contributions to physics are groundbreaking, OSIRIS-REx’s primary objective—returning a sample from Bennu—has revealed equally fascinating results about the asteroid itself. In September 2023, the spacecraft delivered 4.3 ounces (122 grams) of material from Bennu, far exceeding the mission’s original goal of collecting 2 ounces. This sample is now being analyzed to uncover the secrets of Bennu’s composition and its potential role in the formation of the solar system and the origins of life on Earth.
The analysis of Bennu’s sample has revealed a rich array of organic compounds, including carbon-based molecules and hydrated minerals, which support the idea that asteroids may have been key contributors to life on Earth. These findings are significant because they suggest that asteroids like Bennu may have transported vital elements, such as water and organic materials, to early Earth, potentially sparking the chemical reactions that led to life. Dante Lauretta, the principal investigator of the OSIRIS-REx mission, emphasized the importance of these findings: “Finding organic compounds and signs of a watery past on Bennu brings us closer to understanding the origins of our solar system and the chemistry that may have sparked life on Earth. It’s a powerful reminder of how deeply we are connected to the universe.”
Additionally, the sample included magnesium sodium phosphate, a mineral that had not been previously detected via remote sensing. This discovery hints at the possibility that Bennu may have originated from a water-rich parent body, suggesting a more complex history than scientists initially thought. Such findings open new avenues for understanding the formation of asteroids and their potential to host or deliver the building blocks of life across the solar system.
Expanding the Mission: OSIRIS-APEX and Planetary Defense
The success of the OSIRIS-REx mission has not only deepened our understanding of Bennu and the early solar system but has also paved the way for expanded missions that will further investigate asteroids and their interactions with Earth. Following the successful sample return, NASA has repurposed the OSIRIS-REx spacecraft for a new mission under the name OSIRIS-APEX. This extended mission will focus on the asteroid Apophis, a near-Earth object that will make a close approach to our planet in 2029.
The mission to Apophis is of particular interest to planetary defense experts. Studying the asteroid’s interactions with Earth’s gravity during its flyby will provide critical data that could inform future planetary defense strategies. Apophis, much like Bennu, is classified as a potentially hazardous asteroid, meaning that detailed studies of its orbit and physical properties are essential for developing methods to deflect or mitigate the threat of similar asteroids. Dani Mendoza DellaGiustina, who will lead the OSIRIS-APEX mission, noted, “The data we gather from Apophis will provide invaluable insights into how asteroids behave in close proximity to Earth, which could be crucial for future planetary defense efforts.”
Beyond planetary defense, the study of Apophis will also contribute to our understanding of how gravitational forces shape asteroid trajectories and physical structures. The extended mission will further leverage the scientific expertise gained from Bennu to explore a new and equally fascinating object in our solar system.
New Frontiers in Space Exploration and Astrobiology
The success of OSIRIS-REx has had a profound impact not just on asteroid science but on broader fields like astrobiology. Following the return of the Bennu sample, the University of Arizona established the Arizona Astrobiology Center, which aims to bring together researchers from various disciplines to study the origins of life on Earth and the possibility of life elsewhere in the universe. This interdisciplinary approach will foster collaboration between experts in planetary science, chemistry, and biology, allowing for a more comprehensive exploration of life’s origins.
The study of Bennu’s organic compounds and hydrated minerals could provide key insights into the conditions necessary for life to emerge, both on Earth and other celestial bodies. This research not only advances our understanding of the past but could also inform future missions that search for life beyond our planet. As Lauretta explained, “The journey of OSIRIS-REx has surpassed our greatest expectations, thanks in large part to the dedication and insight of the students who have been at the heart of this mission.” By involving students in this groundbreaking work, the mission has not only expanded scientific knowledge but also helped train the next generation of planetary scientists.
With Bennu’s sample now offering a wealth of data and future missions like OSIRIS-APEX set to explore new frontiers, the impact of this mission will be felt for years to come, as researchers continue to uncover the mysteries of the solar system and our place within it.