Science ❯ Astronomy

Comets

Interstellar Objects 3I/ATLAS Interstellar Comets Characteristics Observation Halley's Comet 3I/Atlas Comet 109P/Swift-Tuttle Discovery Swift-Tuttle Visibility Comet Behavior Observation Techniques Comet Thatcher Comet Swift-Tuttle Comet Lemmon Composition Orbital Mechanics C/2023 A3 Tsuchinshan-ATLAS C/2023 A3 (Tsuchinshan-ATLAS) C/2023 A3 C/2025 A6 (Lemmon) Observations C/2025 K1 (ATLAS) Historical Context Comet 12P/Pons-Brooks Comet Encke Comet 3I/ATLAS Comet 55P/Tempel-Tuttle Comet Characteristics Swift-Tuttle Comet Tsuchinshan-ATLAS Periodic Comets Chemical Composition Sungrazers Comet Composition 109P/Swift-Tuttle C/2026 A1 (MAPS) C/2024 G3 (ATLAS) Trajectory 31/ATLAS Comet 96P/Machholz 3i/Atlas 12P/Pons-Brooks C/2025 A6 Lemmon Characteristics of Comets 55P/Tempel-Tuttle Comet ATLAS Research Meteor Showers Observational Techniques Comet Halley Oort Cloud Comet 1P/Halley Comet C/2023 A3 C/2023 A3 Tsuchinshan-Atlas Tsuchinshan-Atlas Long-Period Comets Brightness Comet 21P/Giacobini-Zinner C/2025 R2 (SWAN) Historical Discoveries Origin Tempel-Tuttle Comet Discovery Impact Events Historical Comets 8P/Tuttle Fragmentation Comet C/1861 G1 Thatcher Comet 96P Machholz Dark Comets C/2024 S1 C/2024 G3 Behavior Sungrazing Comets Kreutz Sungrazers 96P/Machholz C/2025 A6 C/2025 R2 SWAN Physical Properties Natural Comets C/2014 UN271 3I Atlas Space Exploration Public Interest Planetary Defense C/2025 R3 (Pan-STARRS) C/2025 R3 (PanSTARRS) C/1861 G1 Thatcher Formation Observational Astronomy Comet Origins Parent Comets Comet A3 Appearance Comet Tsuchinshan-ATLAS Comet A3 (Tsuchinshan-ATLAS) C/2023 A3 (Tsuchinshan-Atlas) Comet Fragments

Perseid Meteor Shower Peaked Overnight as New Moon and Eclipse Produced Ideal Dark Skies

Dark new‑moon skies combined with a total solar eclipse over parts of Europe to give wide public access through NASA’s live ALaMO broadcast

Perseid Meteor Shower Peaks Tonight Under New‑Moon Skies

Two Meteor Showers Peak Together Late July as Moonlight Cuts Visibility

Perseids Set for New‑Moon Peak That Could Deliver Unusually Bright Fireballs

VLT Confirms Ancient, Non‑Solar Chemistry in Interstellar Comet 3I/ATLAS

Webb Reveals 3I/ATLAS as an Ancient Comet Born in a Frigid, Metal‑Poor Environment

Interstellar Comet 3I/ATLAS Shows Ancient, Cold Origin in JWST and Ground Spectra

SETI Finds No Radio Signs From Interstellar Visitor 3I/ATLAS

SETI Radio Search Finds No Alien Technology on Interstellar Comet 3I/ATLAS

Webb Detects Methane on Interstellar Comet 3I/ATLAS

Eta Aquariid Meteor Shower Peaks Before Dawn Under Bright Moonlight

Eta Aquariid Meteor Shower Peaks May 5–6 Under Bright Moonlight

Interstellar Comet 3I/ATLAS Shows Extreme Heavy-Water Enrichment, Study Finds

Lyrid Meteor Shower Peaks Overnight Tuesday Into Wednesday With Favorable Dark Skies

Comet Pan‑STARRS Reaches Perihelion Sunday, Closing a Brief Pre‑Dawn Viewing Window

Lyrid Meteor Shower Builds Toward Peak Next Week Under Dark Skies

JWST Detects Methane From Interstellar Comet 3I/ATLAS

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

New Meteor Shower Traces to Asteroid Crumbling Near the Sun

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