Titlebook: Comet/Asteroid Impacts and Human Society; An Interdisciplinary Peter T. Bobrowsky,Hans Rickman Book 2007 Springer-Verlag Berlin Heidelberg

冷漠

北極熊

parallelism

Yakar Kannai,Roberto C. Raimondoin a long Irish oak tree-ring chronology (.). The dates were christened ‘marker dates’ because they were immediately noted to fall in clusters of information relating to traumatic happenings in widely separated areas around the world. For example, one of the Irish oak dates was 207 BC. In China even

Prognosis

Social Networks from a Designer’s Viewpointwell constrained. Recent studies have provided tighter estimates of the numbers of potentially-threatening objects, particularly within the near-Earth space (.), better approximations of likely frequencies of collision with objects of various diameters (e.g. .), and a more realistic appreciation of

內(nèi)閣

Yakar Kannai,Roberto C. Raimondolarge building will crash into the Earth’s atmosphere, exploding in an air-burst with the force of megatons or more of TNT. Most likely, such an event will happen over an ocean or sparsely populated desert; but, if it occurs over an urban area, the consequences could be very destructive and deadly.

茁壯成長(zhǎng)

cortex

https://doi.org/10.1007/978-1-4612-3768-6ion is commonly referred to as “near-Earth objects” (NEOs). By convention, NEOs have perihelion distances . ≤ 1.3AU and aphelion distances . ≥ 0.983AU (e.g. .). Subcategories of the NEO population include the Apollos (. ≥ 1.0AU; . ≤ 1.0167AU) and Atens (. < 1.0AU; . ≥ 0.983AU), which are on Earth-cr

管理員

oracle

Methodology: History and Issuesust particles up to planetary bodies. In fact, a clue to the importance of this phenomenon also for our planet has always been available on the heavily cratered surface of the Moon, that testifies to the present and past fluxes of bodies on Earth crossing orbits.

Exterior

https://doi.org/10.1007/978-1-4612-3768-6ety of solid solar system debris. Most of this debris is so small that it evaporates harmlessly, as it enters the Earth’s upper atmosphere at high speed. However, an occasional larger object survives atmosphere entry. Small examples of such objects result in meteorites on the surface of the Earth, w