Assertion: voyager | /r/CapableOf | discover great dark spot
Facets:
value: at neptune
type: LOCATION
Source sentences:
text: At Neptune, Voyager 2 discovered five moons, four rings, and a "Great Dark Spot.
text: While in the neighborhood of Neptune, Voyager 2 discovered the "Great Dark Spot", which has since disappeared, according to observations by the Hubble Space Telescope.