ORB means Observatoire Royal de Belgique
Royal Observatory of Belgium in
Astronomy
Similar to ORB
CMA - Canis Majoris A
CMB - Cosmic Microwave Background
CMBR - Cosmic Microwave Background Radiation
CME - Coronal Mass Ejections
CMF - Core Mass Function
CMT - Carlsberg Meridian Telescope
CNS - Central Navigation System
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