Assertion: mercury | /r/HasProperty | bombarded by asteroid
Facets:
value: heavily
type: DEGREE
value: during the late heavy bombardment period
type: TEMPORAL
value: during a possibly separate subsequent episode
type: TEMPORAL
value: following its formation
type: TEMPORAL
Source sentences:
text: Mercury was heavily bombarded by comets and asteroids during and shortly following its formation 4.6 billion years ago, as well as during a possibly separate subsequent episode called the Late Heavy Bombardment that ended 3.8 billion years ago.
text: During and following its formation 4.6 billion years ago, Mercury was heavily bombarded by comets and asteroids, and perhaps again during the Late Heavy Bombardment period.
text: Mercury was heavily bombarded by asteroids and comets about 3.8 billion years ago during the Late Heavy Bombardment period.