Assertion: asteroid | /r/HasProperty | discovered by a four-step process
Facets:
value: until 1998
type: TEMPORAL
Source sentences:
text: Until 1998, asteroids were discovered by a four-step process.
text: Until 1998, asteroids were discovered by a four-step process.
text: Until 1998, asteroids were discovered by a four-step process.
text: Until 1998, asteroids were discovered by a four-step process.