Strange Green Glow From Comet 3I/ATLAS Puzzles Scientists
- Recent images of interstellar comet 3I/ATLAS, captured during teh September 7, 2025 total lunar eclipse, reveal a striking green hue.
- Comets frequently enough exhibit a green glow when heated, releasing vapor.
- The unusual green glow of 3I/ATLAS presents a scientific puzzle.
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Interstellar Comet 3I/ATLAS Displays Unexpected Green Glow
What Happened?
Recent images of interstellar comet 3I/ATLAS, captured during teh September 7, 2025 total lunar eclipse, reveal a striking green hue. This observation is intriguing as the comet’s chemical composition, as currently understood, doesn’t readily explain the green glow.
for the past few days, the interstellar comet 3I/ATLAS has been displaying a blue-green gas coma measuring 2.5 arcminutes across. A short tail was also visible on September 9 when photographed with the 12″/f-3.6 astrograph in Namibia. image Gerald Rhemann, Michael Jäger pic.twitter.com/N3rXvYn3N8
– Michael Jäger (@comet123 jager) September 10, 2025
Comets frequently enough exhibit a green glow when heated, releasing vapor. Though, this glow is typically caused by dicarbon (C2) molecules. Initial observations of 3I/ATLAS have shown limited evidence of C2, raising questions about the source of the observed green color.
Why Does This Matter?
The unusual green glow of 3I/ATLAS presents a scientific puzzle. It suggests that either the comet contains C2 in quantities not yet detected,or an entirely different molecule is responsible for the green emission. understanding the source of this glow will provide valuable insights into the comet’s composition and the chemical processes occurring within it.
Understanding Comet Glow: A Deeper Dive
The green glow in comets is a well-known phenomenon, but its underlying chemistry is complex. Typically, the process involves the following:
- Solar Radiation: Sunlight breaks down molecules in the comet’s coma (the cloud of gas and dust surrounding the nucleus).
- Dicarbon Production: This breakdown frequently enough produces dicarbon (C2) molecules.
- Fluorescence: C2 molecules absorb ultraviolet (UV) radiation from the sun and re-emit it as green light through a process called fluorescence.
However, the absence of significant C2 detection in 3I/ATLAS suggests an alternative mechanism is at play. Potential explanations include:
- Undetected C2: The C2 molecules may be present but at concentrations below current detection limits, or distributed uneven