Assertion: moon | /r/HasProperty | discovered
Facets:
value: outside of the earth’s moon
type: LOCATION
value: a year
type: TEMPORAL
Source sentences:
text: The first two moons to be discovered were Titania and Oberon, which were spotted by Sir William Herschel on January 11, 1787, six years after he had discovered the planet itself.
text: Although the first two Uranian moons were discovered in 1787, they were not named until 1852, a year after two more moons had been discovered.
text: The first moons to be discovered outside of the Earth’s moon were the Galilean moons of Jupiter, named after astronomer and discoverer Galileo Galilei.
text: Speculation about the existence of the moons of Mars had begun when the moons of Jupiter were discovered.