Science ❯ Astronomy ❯ Comets

Observation

3I/ATLAS Tsuchinshan-ATLAS Comet Lemmon 3I/Atlas C/2025 A6 Lemmon Comet A3 Tsuchinshan-ATLAS Photography Historical Significance Swan25B Comet SWAN Long-Period Comets Lemmon (C/2025 A6) Research Stargazing Comet C/2025 A6 (Lemmon) C/2025 R2 SWAN SWAN and Lemmon C/2025 A6 (Lemmon) Astrophotography Space Exploration C/2023 A3 Tsuchinshan-ATLAS C/2024 S1 (Atlas) C/2023 A3 (Tsuchinshan-ATLAS)

Interstellar Comet 3I/ATLAS Reappears to Earth View as Anomalies Drive Push for Faster Data Releases

Scientists and lawmakers urge faster release of spacecraft data to explain the comet’s unusual brightening, blue hue, measured acceleration.

Comet Lemmon Makes Closest Approach Oct. 20–21 With Prime Viewing Under New Moon

Comet Lemmon Brightens Ahead of Oct. 20–21 Peak, Now Near the Big Dipper

Twin Green Comets Enter Prime Viewing Week Before Closest Approaches

Comets Lemmon and SWAN Poised for Best Viewing Oct. 20–21