NASA’s SPHEREx mission has made significant strides in enhancing our understanding of the Universe by capturing crucial data on the interstellar object known as 3I/ATLAS. This object, the third of its kind detected within our Solar System, emerged from behind the Sun in December 2022. The mission’s advanced capabilities have allowed scientists to observe 3I/ATLAS during its journey toward the outer Solar System.
SPHEREx, which stands for the Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer, has been designed to perform an all-sky survey over its two-year mission. It aims to collect data from over 450 million galaxies and 100 million stars in the Milky Way. This ambitious project seeks to explore the origins and evolution of the Universe, while also providing opportunities for additional observations of unique celestial phenomena.
Observations of 3I/ATLAS
As 3I/ATLAS approached the Sun, its bright coma—a gaseous envelope formed by sublimating ice—was revealed in stunning detail through SPHEREx’s triple-mirror telescope. This instrument is capable of observing the sky in 102 different colors, each corresponding to a specific infrared (IR) wavelength. The data collected has provided insights into the composition of 3I/ATLAS’s coma, which includes critical elements such as water vapor, carbon dioxide, dust, and organic molecules.
The observations made by SPHEREx will enhance our understanding of 3I/ATLAS’s composition and its behavior as it experiences the Sun’s heat. As the object moves through the Solar System, scientists are particularly interested in how its ices react to this increased thermal exposure. The information gathered during this time is expected to yield valuable insights into the processes governing interstellar objects and their potential origins.
In late October 2022, 3I/ATLAS became hidden behind the Sun, leaving scientists eager for its return to visibility. As it re-emerged, the mission team anticipated increased outgassing, which would further illuminate the object’s inner structure and composition. Continuous observations of 3I/ATLAS by SPHEREx, alongside data from other missions, will ultimately contribute to a broader understanding of its system of origin.
Implications for Future Research
The findings from SPHEREx are not only critical for understanding 3I/ATLAS but also have implications for the study of complex organic molecules (COMs) throughout the cosmos. These molecules are essential in the search for potential signs of life beyond Earth. As scientists analyse the data collected from SPHEREx, they hope to uncover more about the building blocks of life and how they may exist elsewhere in the Universe.
NASA’s commitment to exploring the Universe continues to bear fruit through missions like SPHEREx. By gathering and sharing this data, the agency not only furthers our understanding of interstellar objects but also enhances our knowledge of the fundamental processes that have shaped the cosmos as we know it. The ongoing observations of 3I/ATLAS will provide a window into the past, guiding future explorations and research efforts in the field of astronomy.
