Cosmic Lexicon

Planetary Science Research Discoveries (PSRD) Glossary, by Planetary Science Research Discoveries
You'll be over the moon with these delightfully concise definitions of terms from planetary and space sciences.
On this page: Ocean of Storms to Oxygen.
Search inside for:  
Title Index: A B C D E F G H I K L M N O P R S T V W

O:  A