411 REFERENCE · Wiktionary
Late Heavy Bombardment
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Alternative forms
en LHB initialism
Proper noun
Late Heavy Bombardment
A prolonged event believed to have occurred around the Hadean-Archean boundary, during which an unusually high number of asteroids hit the terrestrial planets and their moons.
en Planetology Earth sciences