Hazards Due to Comets and Asteroids最新文献

DoD TECHNOLOGIES AND MISSIONS OF RELEVANCE TO ASTEROID AND COMET EXPLORATION 与小行星和彗星探测相关的国防部技术和任务

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.27

S. Nozeite, L. Pleasance, D. Barnhart, D. Dunham

引用次数: 0

DEFENDING THE EARTH AGAINST IMPACTS FROM LARGE COMETS AND ASTEROIDS 保护地球免受大型彗星和小行星的撞击

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.37

V. A. Simonenko, V. Nogin, D. Petrov, O. N. Shubin, J. Solem

引用次数: 1

EARLY IMPACTS: 早期的影响:

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.5

E. Levy

引用次数: 6

HAZARDS DUE TO GIANT COMETS: 巨大彗星造成的危害:

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.21

M. Bailey, S. Clube, G. Hahn, W. Napier, G. Valsecchi

引用次数: 0

NON-NUCLEAR STRATEGIES FOR DEFLECTING COMETS AND ASTEROIDS 使彗星和小行星偏转的非核策略

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.44

H. Melosh, I. Nemchinov, Y. Zetzer

引用次数: 39

THE LESSON OF GRAND FORKS: 大叉的教训:

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.50

R. L. Park, L. Garver, Terry Dawson

引用次数: 0

COST AND BENEFIT OF NEAR-EARTH OBJECT DETECTION AND INTERCEPTION 近地目标探测与拦截的成本与效益

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.47

G. Canavan

引用次数: 4

THE IMPACT HAZARD: 冲击危害:

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.45

D. Morrison

{"title":"THE IMPACT HAZARD:","authors":"D. Morrison","doi":"10.2307/j.ctv23khmpv.45","DOIUrl":"https://doi.org/10.2307/j.ctv23khmpv.45","url":null,"abstract":"The Earth has been subject to hypervelocity impacts from comets and asteroids since its formation, and such impacts have played an important role in the evolution of life on our planet. We now recognize not only the historical role of impacts, but the contemporary hazard posed by such events. In the absence of a complete census of potentially threatening Earth-crossing asteroids or comets (called collectively Near Earth Objects, or NEOs), or even of a comprehensive cur-rent search program to identify NEOs, we can consider the hazard only from a probabilistic perspective. We know the steep power-law relationship between NEO numbers and size, with many more small bodies than large ones. We also know that few objects less than about 50 m in diameter (with kinetic energy near 10 megatons) penetrate the atmosphere and are capable of doing surface damage. But there is a spectrum of possible impact hazards associated with objects from this 10-megaton threshold all the way up to NEOs 5 km or larger in diameter, which are capable of inflicting severe damage on the environment, leading to mass extinction's of species. Detailed analysis has shown that, in general, the larger the object the greater the hazard, even when allowance is made for the infrequency of large impacts. Most of the danger to human life is associated with impacts by objects roughly 2 km or larger (energy greater than 1 million megatons), which can inject sufficient submicrometer dust into the atmosphere to produce a severe short-term global cooling with subsequent loss of crops, leading to starvation. Hazard estimates suggest that the chance of such an event occurring during a human lifetime is about 1:5000, and the global probability of death from such impacts is of the order of 1:20000, values that can be compared with risks associated with other natural hazards such as earthquakes, volcanic eruptions, and severe storms. However, the impact hazard differs from the others in that it can be largely prevented by a comprehensive survey for threatening objects and the application of technological solutions to deflect or destroy objects that are found to have orbits that will lead to collision with the Earth.","PeriodicalId":301925,"journal":{"name":"Hazards Due to Comets and Asteroids","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116118595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23

EVALUATING SPACE RESOURCES IN THE CONTEXT OF EARTH IMPACT HAZARDS: 在地球撞击危险的背景下评价空间资源;

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.49

W. Hartmann, A. Sokolov

引用次数: 0

THE POPULATION OF EARTH-CROSSING ASTEROIDS 穿越地球的小行星数量

Hazards Due to Comets and Asteroids Pub Date : 2021-11-30 DOI: 10.2307/j.ctv23khmpv.15

David L. Rabinowitz, E. Bowell, E. Shoemaker, K. Muinonen

引用次数: 27