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- Q591571 subject Q6432216.
- Q591571 subject Q6809598.
- Q591571 subject Q7485015.
- Q591571 subject Q8529717.
- Q591571 subject Q8759526.
- Q591571 abstract "The Late Heavy Bombardment (abbreviated LHB and also known as the lunar cataclysm) is an event thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago, corresponding to the Neohadean and Eoarchean eras on Earth. During this interval, a disproportionately large number of asteroids apparently collided with the early terrestrial planets in the inner Solar System, including Mercury, Venus, Earth, and Mars. The LHB happened after the Earth and other rocky planets had formed and accreted most of their mass, but still quite early in Earth's history.Evidence for the LHB derives from lunar samples brought back by the Apollo astronauts. Isotopic dating of Moon rocks implies that most impact melts occurred in a rather narrow interval of time. Several hypotheses are now offered to explain the apparent spike in the flux of impactors (i.e. asteroids and comets) in the inner Solar System, but no consensus yet exists. The Nice model is popular among planetary scientists; it postulates that the gas giant planets underwent orbital migration and scattered objects in the asteroid and/or Kuiper belts into eccentric orbits, and thereby into the path of the terrestrial planets. Other researchers argue that the lunar sample data do not require a cataclysmic cratering event near 3.9 Ga, and that the apparent clustering of impact melt ages near this time is an artifact of sampling materials retrieved from a single large impact basin. They also note that the rate of impact cratering could be significantly different between the outer and inner zones of the Solar System.".
- Q591571 thumbnail Lunar_cataclysm.jpg?width=300.
- Q591571 wikiPageExternalLink cataclysmDynamics.html.
- Q591571 wikiPageExternalLink lunarCataclysm.html.
- Q591571 wikiPageExternalLink earth_bombarded_020724.html.
- Q591571 wikiPageExternalLink template.cfm?name=LHB.
- Q591571 wikiPageExternalLink 060417_mm_lunar_meteor.html.
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- Q591571 comment "The Late Heavy Bombardment (abbreviated LHB and also known as the lunar cataclysm) is an event thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago, corresponding to the Neohadean and Eoarchean eras on Earth. During this interval, a disproportionately large number of asteroids apparently collided with the early terrestrial planets in the inner Solar System, including Mercury, Venus, Earth, and Mars.".
- Q591571 label "Late Heavy Bombardment".
- Q591571 depiction Lunar_cataclysm.jpg.