NASA’s SPHEREx Telescope Detects Organic Molecules in Interstellar Comet 3I/ATLAS
- NASA’s SPHEREx space telescope has detected organic molecules, the building blocks of life, emanating from comet 3I/ATLAS, an interstellar visitor to our solar system.
- The SPHEREx mission, a collaboration between the United States’ NASA and South Korea, is primarily designed to map 450 million galaxies and 100 million stars to better understand...
- Comet 3I/ATLAS was initially discovered in July 2024 using NASA’s ATLAS survey telescope.
NASA’s SPHEREx space telescope has detected organic molecules, the building blocks of life, emanating from comet 3I/ATLAS, an interstellar visitor to our solar system. This discovery, made during observations in , offers a rare opportunity to study the chemical composition of a system originating outside our own, without the need for interstellar travel.
The SPHEREx mission, a collaboration between the United States’ NASA and South Korea, is primarily designed to map 450 million galaxies and 100 million stars to better understand the origins of the universe. However, scientists took the opportunity to observe 3I/ATLAS, only the third interstellar object ever detected within our solar system. The observations revealed the presence of water, carbon dioxide, carbon monoxide, and cyanide – all organic molecules crucial for the formation of life as we know it.
Comet 3I/ATLAS was initially discovered in using NASA’s ATLAS survey telescope. Subsequent orbital analysis confirmed its interstellar origin. Researchers compared observational data from with follow-up observations in , revealing significant changes in the comet’s composition as it journeyed closer to the sun.
Initially, the comet was characterized by a dominance of carbon dioxide with relatively little water. However, as 3I/ATLAS approached the sun, its chemical activity dramatically increased. This phenomenon is attributed to sublimation – a process where solid ice transforms directly into gas due to the sun’s heat. Because heat penetrates the comet’s nucleus slowly, the most active release of material occurred after the comet passed its closest point to the sun (perihelion). This resulted in a significant increase in brightness and molecular diversity during the observations.
“Comet 3I/ATLAS was full-on erupting into space in , after its close flyby of the Sun, causing it to significantly brighten. Even water ice was quickly sublimating into gas in interplanetary space,” said Carey Lisse of Johns Hopkins Applied Physics Laboratory in Laurel, Maryland.
The success of these observations is largely due to SPHEREx’s location in space. Molecules like water and carbon dioxide are difficult to detect from Earth-based telescopes because the infrared light they emit is absorbed by our atmosphere. By operating outside the atmosphere, SPHEREx can precisely capture specific infrared wavelengths, allowing it to map the organic materials released by the comet.
The detection of these organic molecules doesn’t necessarily indicate the presence of life, but it does highlight the potential for the building blocks of life to exist elsewhere in the universe. Organic molecules can be created through both biological and non-biological processes. This discovery provides a unique opportunity to study the chemical composition of a planetary system formed around a different star.
Researchers will continue to collect data to compare the characteristics of comets from our solar system with those originating from interstellar space. This long-term study is expected to help scientists understand the processes involved in the formation of exoplanetary systems and how the materials necessary for life might be distributed throughout the universe. The findings contribute to a broader understanding of the origins of our own solar system and the potential for life beyond Earth.
The comet’s composition also reveals insights into its formation. Comets are often described as “dirty snowballs,” consisting of ice, dust, and organic compounds. The fact that 3I/ATLAS released a significant amount of carbon-rich material suggests that its icy core contained a substantial amount of these compounds, locked away deep within the comet’s structure. This provides clues about the conditions present in the region of space where the comet originated.
As 3I/ATLAS continues its journey out of our solar system, SPHEREx and other telescopes will continue to monitor it, providing valuable data for future research. The information gathered from this interstellar visitor will undoubtedly contribute to our understanding of the universe and our place within it.