Final answer:
The Late Heavy Bombardment occurred approximately between 4.1 to 3.8 billion years ago and was a period of intense asteroid and comet bombardment on the terrestrial planets, which played a significant role in Earth's geological history.
Step-by-step explanation:
The Late Heavy Bombardment (LHB), also known as the Lunar Cataclysm, is a hypothesized event in our solar system's history that suggests a period of intense asteroid and comet impacts on the terrestrial planets, including Earth and the Moon. It is believed to have occurred approximately 4.1 to 3.8 billion years ago, during the Hadean and early Archean eons.
The concept of the LHB comes from the examination of moon rocks and lunar craters, suggesting that a dramatic increase in the rate of impact events took place during this period. This period of increased cratering is thought to be due to changes in the orbits of asteroids and comets within the solar system, perhaps triggered by the migration of the outer planets.
The LHB was a fundamental event in the history of our planet, affecting its geological evolution and possibly playing a role in shaping the environment for the origin of life.