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Asteroids --- Astéroïdes --- Collisions with Earth. --- Collisions avec la Terre --- Near-Earth objects --- Collisions with Earth --- 523.6 --- Interplanetary medium --- Astéroïdes --- NEOs (Near-Earth objects) --- Comets --- Meteors --- Collisions of asteroids with Earth --- Impact of asteroids with Earth --- Collisions (Astrophysics) --- Natural disasters --- Near-earth asteroids --- Asteroids - Collisions with Earth

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When in 1981 Louis and Walter Alvarez, the father and son team, unearthed a tell-tale Iridium-rich sedimentary horizon at the 65 million years-old Cretaceous-Tertiary boundary at Gubbio, Italy, their find heralded a paradigm shift in the study of terrestrial evolution.  Since the 1980s the discovery and study of asteroid impact ejecta in the oldest well-preserved terrains of Western Australia and South Africa, by Don Lowe, Gary Byerly, Bruce Simonson, the author and others, and the documentation of new exposed and buried impact structures in several continents, led to a resurgence of the idea of the catastrophism theory of Cuvier, earlier largely supplanted by the uniformitarian theory of Hutton and Lyell. Several mass extinction of species events are known to have occurred in temporal proximity to large asteroid impacts, global volcanic eruptions and continental splitting. Likely links are observed between asteroid clusters and at 580 Ma, end-Devonian, end-Triassic and end-Jurassic extinctions. New discoveries of ~3.5 Ga-old impact fallout units in South Africa have led Lowe and Byerly to propose a protracted continuation of the Late Heavy Bombardment (~3.95-3.85 Ga) in the Earth-Moon system. Given the difficulty in identifying asteroid impact ejecta units and buried impact structures, it is likely new discoveries of impact signatures are in store, which would further profoundly alter models of terrestrial evolution.

Asteroids -- Collisions with Earth. --- Catastrophes (Geology). --- Cosmogony. --- Impact craters. --- Asteroids --- Cosmogony --- Impact craters --- Catastrophes (Geology) --- Geology, Stratigraphic --- Astronomy & Astrophysics --- Physical Sciences & Mathematics --- Astrophysics --- Collisions with Earth --- Collisions with Earth. --- Earth (Planet) --- Surface. --- Astroblemes --- Impact structures --- Collisions of asteroids with Earth --- Impact of asteroids with Earth --- Earth sciences. --- Planetology. --- Atmospheric sciences. --- Space sciences. --- Earth Sciences. --- Extraterrestrial Physics, Space Sciences. --- Atmospheric Sciences. --- Crust --- Cratering --- Geology, Structural --- Collisions (Astrophysics) --- Natural disasters --- Near-earth asteroids --- Astrophysics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Planetary sciences --- Planetology --- Atmospheric sciences --- Earth sciences --- Atmosphere --- Science and space --- Space research --- Cosmology --- Science

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The mounting problem of space debris in low earth orbit and its threat to the operation of application satellites has been increasingly recognized as space activities increase. The efforts of the Inter Agency Space Debris Coordinating Committee (IADC) and UN COPUS have now led to international guidelines to mitigate the creation of new debris. This book discusses the technical studies being developed for active removal processes and otherwise mitigating problems of space debris, particularly in low earth orbit. This book also considers threats to space systems and the Earth that comes from natural causes such as asteroids, coronal mass ejections, and radiation. After more than half a century of space applications and explorations, the time has come to consider ways to provide sustainability for long-term space activities. .

Asteroids -- Collisions with Earth -- Juvenile literature. --- Asteroids. --- Emergency management -- Juvenile literature. --- Extraterrestrial anthropology -- Juvenile literature. --- Life on other planets -- Juvenile literature. --- Space debris --- Space environment --- Near-Earth objects --- Hazard mitigation --- Mechanical Engineering --- Engineering & Applied Sciences --- Aeronautics Engineering & Astronautics --- Space debris. --- Space environment. --- Environment, Space --- Extraterrestrial environment --- Space weather --- Debris, Space --- Junk in space --- Orbital debris --- Space junk --- Engineering. --- Space sciences. --- Aerospace engineering. --- Astronautics. --- Pollution. --- Aerospace Technology and Astronautics. --- Extraterrestrial Physics, Space Sciences. --- Pollution, general. --- Extreme environments --- Space pollution --- Astrophysics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Chemical pollution --- Chemicals --- Contamination of environment --- Environmental pollution --- Pollution --- Contamination (Technology) --- Asbestos abatement --- Bioremediation --- Environmental engineering --- Environmental quality --- Factory and trade waste --- Hazardous waste site remediation --- Hazardous wastes --- In situ remediation --- Lead abatement --- Pollutants --- Refuse and refuse disposal --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Space sciences --- Aeronautics --- Astrodynamics --- Space flight --- Space vehicles --- Environmental aspects --- Science and space --- Space research --- Cosmology --- Science --- Aeronautical engineering --- Astronautics --- Engineering