1. The study of planets, planetary systems and the solar system
   - planetology

Encyclopedia: Planetary science

• genus Chelydra
• genus Chenopodium
• genus Chilomastix
• genus Chilomeniscus
• genus Chilomycterus
• genus Chilopsis
• genus Chimaera
• genus Chimaphila
• genus Chimonanthus
• genus Chinchilla
• genus Chinchona
• genus Chiococca
• genus Chionanthus
• genus Chirocephalus
• genus Chironomus
• genus Chiton
• genus Chlamydera
• genus Chlamydia
• genus Chlamydomonas
• genus Chlamydosaurus
• genus Chlamyphorus
• genus Chloranthus
• genus Chlorella
• genus Chloris
• genus Chlorococcum