Science ❯ Astrophysics ❯ Celestial Mechanics

Interstellar Objects

Comet Characteristics Trajectory Analysis Comet Dynamics

Hubble and Infrared Observations Show 3I/ATLAS Is an Active Interstellar Comet

Thanks to Hubble’s sharp images and infrared spectroscopy, astronomers place the nucleus at 320 m–5.6 km and confirm active dust emission under a red spectral slope.