Resumen
This study examines the history of the paradigm concerning a lunar (or solar-system-wide) terminal cataclysm (also called ?Late Heavy Bombardment? or LHB), a putative, brief spike in impacts at ~3.9 Ga ago, preceded by low impact rates. We examine origin of the ideas, why they were accepted, and why the ideas are currently being seriously revised, if not abandoned. The paper is divided into the following sections: