Collisions are one of the key processes sha** planetary systems. Asteroid families are
outcomes of such collision still identifiable across our solar system. The families provide a …

This article presents a current (as of September 2019) list of recommended ages for proven
terrestrial impact structures (n= 200) and deposits (n= 46) sourced from the primary …

The petrology record on the Moon suggests that a cataclysmic spike in the cratering rate
occurred∼ 700 million years after the planets formed; this event is known as the Late Heavy …

Relict spinel grains (~ 25–250μm in diameter) from decomposed extraterrestrial material in
Archean to Recent sediments can be used to reconstruct variations in the flux of different …

Lunar meteorites represent a more random sampling of lunar material than the Apollo or
Luna collections and, as such, lunar meteorite impact melt ages are the most important data …

The discovery of 248 dated impact sites known to have formed within the last few decades
allows us to refine the current cratering rate and slope of the production function at Mars. We …

The Oort cloud is the primary source of the long-period comets. We describe what is known
about the population and mass of the Oort cloud, including the hypothetical inner Oort cloud; …

The rise and diversification of shelled invertebrate life in the early Phanerozoic eon occurred
in two major stages. During the first stage (termed as the Cambrian explosion), a large …

The accretion of planets involved a high flux of planetesimal impactors in the first 107 108 yr,
a flux on the order of 109× the present flux. Dynamical models suggest that the early …

Forty fossil meteorites with a total original mass of∼ 7.7 kg have been recovered in the first
systematic search for fossil meteorites, pursued in an active quarry in Lower Ordovician (480 …