What molecule is responsible for the distinct emerald glow exhibited by Comet C/2025 A6 (Lemmon)?
Answer
Diatomic carbon (C2)
While cometary tails often appear pale blue due to ionized gases, certain comets develop striking colors in their coma or head due to specific molecules present. Comet C/2025 A6 (Lemmon) was noted for its striking emerald glow, which is directly attributed to the presence of diatomic carbon, represented chemically as C2. This molecule absorbs solar radiation, becomes excited, and subsequently emits light, creating the signature green hue. This excitation process is relatively short-lived, as sunlight rapidly breaks down the diatomic carbon molecules.
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