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Surface Processes on Metal Worlds: S...

Christoph, John M.

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Surface Processes on Metal Worlds: Space Weathering and Regolith Formation on Metal-Rich Asteroids.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Surface Processes on Metal Worlds: Space Weathering and Regolith Formation on Metal-Rich Asteroids./
Author:	Christoph, John M.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	169 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
Subject:	Planetology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30425687
ISBN:	9798379528195

Surface Processes on Metal Worlds: Space Weathering and Regolith Formation on Metal-Rich Asteroids.
Christoph, John M.

Surface Processes on Metal Worlds: Space Weathering and Regolith Formation on Metal-Rich Asteroids. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 169 p.

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--Arizona State University, 2023.

This item must not be sold to any third party vendors.

With the National Aeronautics and Space Administration (NASA) Psyche Mission, humans will soon have the first opportunity to explore a new kind of planetary body: one composed mostly of metal as opposed to stony minerals or ices. Identifying the composition of asteroids from Earth-based observations has been an ongoing challenge. Although optical reflectance spectra, radar, and orbital dynamics can constrain an asteroid's mineralogy and bulk density, in many cases there is not a clear or precise match with analogous materials such as meteorites. Additionally, the surfaces of asteroids and other small, airless planetary bodies can be heavily modified over geologic time by exposure to the space environment. To accurately interpret remote sensing observations of metal-rich asteroids, it is therefore necessary to understand how the processes active on asteroid surfaces affect metallic materials. This dissertation represents a first step toward that understanding. In collaboration with many colleagues, I have performed laboratory experiments on iron meteorites to simulate solar wind ion irradiation, surface heating, micrometeoroid bombardment, and high-velocity impacts. Characterizing the meteorite surface's physical and chemical properties before and after each experiment can constrain the effects of each process on a metal-rich surface in space. While additional work will be needed for a complete understanding, it is nevertheless possible to make some early predictions of what (16) Psyche's surface regolith might look like when humans observe it up close. Moreover, the results of these experiments will inform future exploration beyond asteroid Psyche as humans attempt to understand how Earth's celestial neighborhood came to be.

ISBN: 9798379528195Subjects--Topical Terms:

546174
Planetology.
Subjects--Index Terms:

Asteroid

Surface Processes on Metal Worlds: Space Weathering and Regolith Formation on Metal-Rich Asteroids.
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500 $a Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
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502 $a Thesis (Ph.D.)--Arizona State University, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a With the National Aeronautics and Space Administration (NASA) Psyche Mission, humans will soon have the first opportunity to explore a new kind of planetary body: one composed mostly of metal as opposed to stony minerals or ices. Identifying the composition of asteroids from Earth-based observations has been an ongoing challenge. Although optical reflectance spectra, radar, and orbital dynamics can constrain an asteroid's mineralogy and bulk density, in many cases there is not a clear or precise match with analogous materials such as meteorites. Additionally, the surfaces of asteroids and other small, airless planetary bodies can be heavily modified over geologic time by exposure to the space environment. To accurately interpret remote sensing observations of metal-rich asteroids, it is therefore necessary to understand how the processes active on asteroid surfaces affect metallic materials. This dissertation represents a first step toward that understanding. In collaboration with many colleagues, I have performed laboratory experiments on iron meteorites to simulate solar wind ion irradiation, surface heating, micrometeoroid bombardment, and high-velocity impacts. Characterizing the meteorite surface's physical and chemical properties before and after each experiment can constrain the effects of each process on a metal-rich surface in space. While additional work will be needed for a complete understanding, it is nevertheless possible to make some early predictions of what (16) Psyche's surface regolith might look like when humans observe it up close. Moreover, the results of these experiments will inform future exploration beyond asteroid Psyche as humans attempt to understand how Earth's celestial neighborhood came to be.
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