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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. Delta-V Impulse (change in velocity) required to accomplish a specific manuever in space Differentiation Internal stratification of a body, caused by heating and usually resulting in a core, mantle, and crust Ecliptic The plane defined by Earth's orbit around the Sun Electromagnetic induction heating Method proposed for asteroid heating, using electric currents induced by variations in a strong solar wind Emission band Radiation emitted by an object at a particular range of wavelengths Interplanetary dust particles Tiny particles that once orbited in the spaces between planets, normally collected in the stratosphere by high-flying aircraft Iron meteorite One composed primarily of iron-nickel alloy Isotopes Cosmogenic Isotope produced by exposure to cosmic rays Radioactive Unstable isotope that decays spontaneously Radiogenic Isotope formed by radioactive decay Kuiper Belt Zone of presumably icy planetesimals located outside the orbit of Neptune Light curve Variations in amplitude observed as an asteroid rotates Metamorphic grade Relative intensity of heating and recrystallization Nodes Two points at which an object's orbit intersects Earth's orbital plane Oort Cloud Spherical halo of icy planetesimals located between approximately 1,000 and 50,000 AU from the Sun Orbital precession Slow, periodic rotation of the long axis of an orbit Parent body Object of asteroidal size from which meteorites were derived Petrology Study of the mineralogy, texture, structures, and origin of rocks Photometry Measurement of light intensities Phyllosilicate Silicate mineral with layered crystal structure Plutonic Rocks that crystallized from magma at depth Radioactive See Isotopes Radiogenic See Isotopes Radiometric dating Determining the age of a sample from measurement of its radionuclides
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