Methane Detected on Interstellar Comet 3I/ATLAS by James Webb Space Telescope
NASA and ESA have detected methane on interstellar comet 3I/ATLAS using the James Webb Space Telescope. Learn about JWST, interstellar objects, comet chemistry, and key UPSC facts.
Why in News?
NASA and the European Space Agency (ESA) have announced the detection of methane on the interstellar comet 3I/ATLAS using the James Webb Space Telescope (JWST). This marks the first direct detection of methane in an interstellar object and the first mid-infrared chemical fingerprint obtained from such a body.
Key Highlights
Methane Detection on 3I/ATLAS
- Observations were made using JWST’s Mid-Infrared Instrument (MIRI).
- Scientists detected methane (CH₄) along with other volatile compounds in the comet.
- It is the first time methane has been directly identified in an interstellar object.
- The discovery provides insights into the chemical composition of planetary systems beyond the Solar System.
Comet 3I/ATLAS
- 3I/ATLAS is the third confirmed interstellar object observed passing through the Solar System.
- It follows:
- 1I/ʻOumuamua (2017)
- 2I/Borisov (2019)
- The comet displayed unusually high levels of carbon dioxide and a methane-to-water ratio different from many Solar System comets.
Importance of Methane in Comet Studies
- Methane is a hydrocarbon with the chemical formula CH₄.
- Along with water and carbon dioxide, methane helps scientists compare the volatile composition of objects formed in different regions of protoplanetary systems.
- Such studies improve understanding of planet formation and the evolution of planetary systems.
Related Organizations and Missions
James Webb Space Telescope (JWST)
- Joint mission of:
- National Aeronautics and Space Administration (NASA)
- European Space Agency (ESA)
- Canadian Space Agency (CSA)
- Launched as the world’s most powerful space observatory.
- Studies the early universe, exoplanets, stars, galaxies, and icy bodies.
Mid-Infrared Instrument (MIRI)
- One of JWST’s key scientific instruments.
- Observes infrared wavelengths useful for studying:
- Cold dust
- Gases
- Comets
- Icy celestial bodies
Prelims Facts
- An interstellar object originates outside the Solar System and travels through it on a hyperbolic trajectory.
- 3I/ATLAS was discovered on 1 July 2025 by the NASA-funded ATLAS survey telescope in Chile.
- JWST observed the comet on 15–16 December 2025 and 27 December 2025.
- The findings were published in The Astrophysical Journal Letters on 8 April 2026.
- During observations, 3I/ATLAS was approximately 329–379 million km from the Sun.
- 3I/ATLAS is the third confirmed interstellar object after 1I/ʻOumuamua and 2I/Borisov.
Mains Relevance
The discovery highlights the growing role of advanced space observatories in studying interstellar objects and understanding the formation of planetary systems beyond the Solar System. It also demonstrates the importance of international cooperation in space science and astronomical research.
