Late Heavy Bombardment
{'<entity_0>': 'Late Heavy Bombardment', '<entity_1>': 'event'}
[['Late Heavy Bombardment', 'description', 'event']]
The <entity_0> (LHB), or lunar cataclysm, is a hypothesized <entity_1> thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago, at a time corresponding to the Neohadean and Eoarchean eras on Earth.
['occurrence', 'journal article']