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Definitions:
Noun
                                                
                        
                            Oort cloud
                        
                                                
                                                    
                
                    
                    Definition: (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun
Definition: A roughly spherical region of space composed of comet-like bodies and other minor planets and asteroids that orbit distantly in planetary systems