Halley's Comet Observation C/2023 A3 C/2023 A3 Tsuchinshan-ATLAS C/2023 A3 (Tsuchinshan-ATLAS) Visibility Tsuchinshan-ATLAS C/2024 G3 (ATLAS) Comet 12P/Pons-Brooks Comet Encke
Observations with Chile’s ALMA telescope reveal carbon monoxide outbursts from Comet C/2014 UN271’s nucleus far beyond Uranus’s orbit.