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1 Introduction to Near-Earth Objects
Pages 3-7

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From page 3...
... The combination of the diversity and accessibility of these bodies presents new opportunities and challenges for space exploration and indicates a need for sufficient ground-based observations of NEOs to identify targets of highest scientific interest. Understanding the orbital and size distributions and the physical characteristics of NEOs may be useful for devising appropriate strategies for mitigating impact hazards.
From page 4...
... plane. Also shown by dashed lines are orbits for the terrestrial planets Mercury through Mars, with their positions on January 1, 1997, indicated.
From page 5...
... Chemical and Mineralogical Compositions Determining the chemical and mineralogical compositions of NEOs provides critical constraints on their formation and evolution, as previously emphasized by the Space Studies Board.6 Their bulk chemistries relate to condensation and other processes thought to have occurred within the solar nebula, and their mineralogies are functions of temperature, pressure, and geologic history (or orbital history, in the case of comets)
From page 6...
... 4. Space Studies Board, National Research Council, An Integrated Strategy for the Planetary Sciences: 1995-2010, National Academy Press, Washington, D.C., 1994, p.
From page 7...
... Newsom and J.H. Jones, eds., Oxford University Press, New York, 1990.

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