ORB means Observatoire Royal de Belgique Royal Observatory of Belgium in Astronomy

Similar to ORB

CFCO - Committee For Crescent Observation
CFCP - Center For Cosmological Physics
CFS - Chandrasekhar - Friedmann - Schutz instability
CG - Central Galaxy
CHSS - Century Halo Star Survey
CMA - Canis Majoris A
CMB - Cosmic Microwave Background

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