Science ❯ Astronomy ❯ Comets

Observation

3I/ATLAS Tsuchinshan-ATLAS Comet Lemmon C/2025 A6 Lemmon 3I/Atlas Comet C/2025 R3 (Pan-STARRS) Space Exploration C/2024 S1 (Atlas) Astrophotography C/2025 A6 (Lemmon) C/2023 A3 Tsuchinshan-ATLAS Comet SWAN Historical Significance C/2025 R2 SWAN C/2023 A3 (Tsuchinshan-ATLAS) Long-Period Comets C/2026 A1 (MAPS) C/2025 R3 (Pan-STARRS) Comet C/2025 A6 (Lemmon) Research SWAN and Lemmon Lemmon (C/2025 A6) Comet A3 Tsuchinshan-ATLAS Hubble Space Telescope Swan25B Stargazing Photography

Brightening Comet Pan‑STARRS Enters Pre‑Dawn View for Northern Skywatchers

A small angle from the Sun will soon hide it in twilight, making this week the best viewing window.

Rare Comet Pan‑STARRS Now Glows Before Dawn for a Short Northern Viewing Window

Hubble Accidentally Captures Comet C/2025 K1 Breaking Into Pieces in Rare Real-Time View

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

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