منابع مشابه
Catastrophic Disruption of Asteroids: Firsts Simulations with Explicit Formation of Spinning Aggregates by Gravitational Reaccumulation
We have recently made a major improvement in the simulations of asteroid disruption by computing explicitly the formation of aggregates during the gravitational reaccumulation of small fragments, allowing us to obtain information on their spin, the number of boulders composing them or lying on their surface, and their shape. We will present the first and preliminary results of this process taki...
متن کاملEURONEAR - Data Mining of Asteroids and Near Earth Asteroids
Besides new observations, mining old photographic plates and CCD image archives represents an opportunity to recover and secure newly discovered asteroids, also to improve the orbits of Near Earth Asteroids (NEAs), Potentially Hazardous Asteroids (PHAs) and Virtual Impactors (VIs). These are the main research aims of the EURONEAR network. As stated by the IAU, the vast collection of image archi...
متن کاملAsteroids: Assessing Catastrophic Risks
We evaluate two risk profiles: i global warming risks and ii collisions with asteroids that can cause the extinction of our species. The expected values computed for these two risks suggest that no action will be taken to avoid extinction. The result is somewhat counterintuitive, but it is typical of the results of using classic decision theory to evaluate catastrophic risks in the distant futu...
متن کاملMineralogy of Asteroids
The past decade has seen a significant expansion both in the interpretive methodologies used to extract mineralogical information from asteroid spectra and other remote-sensing data and in the number of asteroids for which mineralogical characterizations exist. Robust mineralogical characterizations now exist for more than 40 asteroids, an order a magnitude increase since Asteroids II was publi...
متن کاملOn Nuking Menacing Asteroids
Introduction: Most scientists now accept that impacts on the earth of large asteroids and comets have occurred in the past, and will, without intervention , occur again; with devastating affects on the earth and all living creatures. About ten years ago, researchers [1,2] and others studied a number of ways that an asteroid could be diverted from an impending collision with the earth by pushing...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/290545a0