Glossary – O
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Oort Cloud
A spherical shell of cometary bodies believed to surround the sun far beyond the orbit of Pluto and from which some are dislodged when perturbed (as by a passing star) to fall toward the sun.
OPAG
Outer Planets Analysis Group
OPR
Outer Planets Research program
OSTP
Office of Science and Technology Policy
overarching
Dominating or embracing all else.
