Assertion: moon | /r/HasProperty | discovered in solar system
Facets:
value: over the last 50 years
type: TEMPORAL
Source sentences:
text: Over the last 50 years, over a hundred more moons have been discovered in the solar system, so that they now total 165, nearly all of them orbiting the larger planets Jupiter, Saturn, and Uranus (Mercury and Venus have no moon), with an additional four moons orbiting dwarf planets.