Science ❯Astronomy

Comets

Interstellar Objects Interstellar Comets 3I/ATLAS Characteristics Halley's Comet Swift-Tuttle Comet 109P/Swift-Tuttle Observation Visibility C/2023 A3 Tsuchinshan-ATLAS

Interstellar Comet 3I/ATLAS Makes Closest Pass to Mars as Spacecraft Observe

ESA orbiters are collecting data during the rare interstellar visitor's closest pass by Mars.

Orionid Meteor Shower Begins, With Peak Oct. 21–22 Under Moonless Skies

Interstellar Comet 3I/ATLAS Withstands Solar Storm as Mars Flyby Nears

Interstellar Comet 3I/ATLAS Slips Behind the Sun as New Study Finds Unusual Polarization

New Analysis Says Interstellar Comet 3I/ATLAS Is Far Larger Than First Estimated

Interstellar Comet 3I/ATLAS Tied to New Planet 'Seeding' Hypothesis

3I/ATLAS Shows Growing Tail and Rapid Brightening as Evidence Favors a Natural Comet

Interstellar Comet 3I/ATLAS Turns Green as Mars Flyby Approaches

New Images Show Interstellar Visitor 3I/ATLAS Growing a Tail as NASA Dismisses Alien-Craft Claims

New Comet SWAN25B Emerges Bright Near the Sun as Orbit Remains Uncertain

NASA Reaffirms 3I/ATLAS Is a Natural Interstellar Comet

Andromeda Galaxy Team Wins 2025 Astronomy Photographer of the Year as London Exhibition Opens

Interstellar Visitor 3I/ATLAS Shows Growing Tail as New Study Finds No Parent Star

SwRI Says Interstellar Comet Flybys Are Achievable as 3I/ATLAS Defies Expectations

Gemini Images Show 3I/ATLAS Growing a Tail, Underscoring Natural Comet Status

New Spectra Show 3I/ATLAS Is a Carbon‑Chain–Depleted Interstellar Comet With Weak CN Emission

Webb and SPHEREx Map CO2‑Dominated Coma of Interstellar Visitor 3I/ATLAS

NASA Affirms 3I/ATLAS Is a Natural Interstellar Comet

JWST Spots CO2-Dominated Coma in Interstellar Comet 3I/ATLAS

Webb and SPHEREx Confirm CO2-Dominated Coma Around Interstellar Comet 3I/ATLAS