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 OPAG

Outer Planets Analysis Group

 OPR

Outer Planets Research program

 OSTP

Office of Science and Technology Policy

 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.
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 overarching

Dominating or embracing all else.
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