Astronomers identified interstellar comet 3I/ATLAS with strange CO₂ emissions, sparking fierce debate over its origins and possible implications.
At a Glance
- 3I/ATLAS is the third interstellar object after ‘Oumuamua and Borisov.
- Telescopes detected water, cyanide, nickel, dust, and extreme CO₂ release.
- Some models suggest the comet is billions of years older than the Solar System.
- Speculation includes theories of alien technology and calls for spacecraft interception.
Discovery and Early Tracking
Astronomers spotted 3I/ATLAS on July 1, 2025, using ATLAS telescopes in Chile. It traveled on a hyperbolic, unbound orbit.
Archival checks showed TESS observed activity as early as May, weeks before discovery. This premature outgassing stunned researchers and drove further observation.
By August, Hubble, JWST, SPHEREx, and Gemini South coordinated to secure data. No prior interstellar object was tracked so quickly.
Watch now: [Everything We Know About 3I/ATLAS, the New ‘Oumuamua]
Composition and Bizarre Chemistry
JWST revealed a coma dominated by CO₂, far exceeding water vapor. This flipped expectations for volatile ratios in interstellar bodies.
SPHEREx added strong water absorption lines alongside CO₂ peaks. Swift ultraviolet spectra confirmed massive OH emission, signaling heavy water sublimation.
Ground-based studies strengthened the puzzle. The MDM Observatory found weak CN emission, while VLT detected nickel vapor and faint cyanide traces.
Ancient Origins and Bold Theories
Trajectory and composition imply an origin within the galaxy’s thick disk. The comet could have formed in an ancient stellar nursery.
Age estimates span 7.6 to 14 billion years. That range exceeds the Solar System’s 4.6 billion-year history, making 3I/ATLAS unusually ancient.
Avi Loeb argued the comet may hide alien probes. Representative Anna Paulina Luna urged NASA to redirect spacecraft like Juno toward interception.
Mainstream astronomers dismissed such claims. They stressed evidence points to a natural, volatile-rich comet. Yet speculation continues as the object races through the inner system.
