Amateur activity
Comet Observing
Following comets as they brighten, grow tails, and fade — estimating their brightness and sketching or photographing their changing structure. Amateurs have a long tradition of discovering comets, and their brightness estimates track how these unpredictable visitors evolve.
Methods, objects & tools
Across public astronomy
Knowledge connections
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.