Glossary
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OPAG
- Outer Planets Analysis Group
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OPR
- Outer Planets Research program
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OSTP
- Office of Science and Technology Policy
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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.
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overarching
- Dominating or embracing all else.
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