Assertion: planet's moon | /r/HasProperty | discovered
Facets:
value: outside of the earth’s moon
type: LOCATION
Source sentences:
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: In 1846, Frederic Petit, director of the observatory of Toulouse, stated that a second moon of the Earth had been discovered.