Assertion: mercury | /r/HasProperty | struck by planetesimal
Facets:
value: early in its history
type: TEMPORAL
Source sentences:
text: The most widely accepted theory is that Mercury was once a larger planet which was struck by a planetesimal measuring several thousand km in diameter.
text: There are also those that believe that Mercury used to have a composition that’s similar to that of a chondrite meteorite before it was struck by a planetesimal quite early in its history thus stripping away its outer crust and its mantle.
text: ’s believed that Mercury used to be similar in composition to a chondrite meteorite, but then it was struck by a planetesimal early in its history that stripped away its outer crust and mantle.