sci.astro - participar
Astronomy discussions and information.
Actividad alta, 1379 suscriptores, Usenet

sci.astro.amateur - participar
Amateur astronomy equipment, techniques, info, etc.
Actividad alta, 2286 suscriptores, Usenet

alt.sci.physics.new-theories - participar
Scientific theories you won't find in journals.
Actividad baja, 559 suscriptores, Usenet