Results 121 to 130 of about 14,489 (149)

Near-Earth Objects

2017
The chances of a random piece of rock striking Earth still exists, but probably to a much reduced level of threat. During the early years in the creation of our Solar System, there was plenty of debris that had yet to settle into some form and order, with constant collisions of large bodies before any structure was imposed.
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The Near-Earth Object Population

Icarus, 2000
We examine the dynamics of a sample of 117 near-Earth objects (NEOs) over a time scale of 60 Myr. We find that while 10–20% end their lifetimes by striking a terrestrial planet (usually Venus or Earth), more than half end their lives in a Sun-grazing state, and about 15% are ejected from the Solar System.
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Near Earth object mitigation studies

2016 IEEE Aerospace Conference, 2016
Early detection of an object on a collision course with Earth, leading to well-considered and effective measures to mitigate its hazards, is not always possible due to a number of extenuating factors. NASA and the Department of Energy (DOE)'s National Nuclear Security Administration (NNSA) have partnered to develop a full systems framework for ...
Bernard D. Seery, Myra Bambacus, Ron Leung, Kevin Greenaugh, Fabien Raccah, Mark Boslough, Chaowei Phil Yang   +6 more
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Near Earth Objects - a threat and an opportunity

Physics Education, 2003
In the past decade the hazard posed to the Earth by Near Earth Objects (NEOs) has generated considerable scientific and public interest. A number of major films, television programmes and media reports have brought the issue to public attention. From an educational perspective an investigation into NEOs and the effects of impacts on the Earth forms a ...
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A Near‐Earth Object Hazard Index

Annals of the New York Academy of Sciences, 1997
ABSTRACT: With the advent of expanded near‐Earth object (NEO) surveys, the number of known close approaches to Earth will increase dramatically. For many of these objects, uncertainties in their preliminary orbits will result in calculations yielding nonzero probabilities of collision over the next century. An index system is proposed which places the
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Peculiar Near-Earth Objects

2005
In this paper we present visible and near-infrared spectroscopy of 7 peculiar NEOs. These objects have been observed within the SINEO (Spectral Investigation of Near-Earth Objects) survey, which have produced more then 100 spectra of NEOs. Among the objects presented here, five of them result to be spectrally peculiar, belonging to the rare V and R ...
MARCHI, SIMONE, LAZZARIN, MONICA, MAGRIN, SARA   +2 more
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The SRT, near-earth objects and space debris

2006
The improvements, by means of radar observations, of the accuracy with which the orbits of near Earth asteroids and comets are determined are a key factor in order to be able to exclude future collisions of any of these bodies with the Earth. The SRT, once equipped with a suitable transmitter, can have an important role in this context.
GB VALSECCHI, A MILANI, ROSSI A, Tommei G   +3 more
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MISSIONS TO NEAR-EARTH OBJECTS

2021
ANDREW F. CHENG, J. VEVERKA, C. PILCHER, ROBERT W. FARQUHAR   +3 more
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ExploreNEOs: The Warm Spitzer Near Earth Object survey

2011
We are carrying out the ExploreNEOs project in which we observe more than 600 near Earth Objects (NEOs) at 3.6 and 4.5 microns with Warm Spitzer. For each NEO we derive diameter and albedo. We present our results to date, which include studies of individual objects, results for our entire observed sample, and, by extrapolation, results for the entire ...
Trilling, D. E., Hora, J. L, Mueller, M., Thomas, C. A., Harris, A. W., Hagen, A. R., Mommert, M., Benner, L., Bhattacharya, B., Bottke, W. F., Chesley, S., Delbo, M., Emery, J. P., Fazio, G., Kistler, J. L., Mainzer, A., Morbidelli, A., Penprase, B., Smith, H. A., Spahr, T. B., Stansberry, J. A.   +20 more
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STUDY OF NEAR EARTH OBJECTS

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2020
Maria Sergienko, Marina Sokolova, Alexey Andreev, Yury Nefedyev, Zoya Andreeva   +4 more
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