Opposition Effect
978-613-0-50681-0
6130506813
76
2010-06-18
34,00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The opposition effect (also opposition spike, or opposition surge) is the brightening of a rough surface, or an object with many particles, when illuminated from directly behind the observer. It is so named because the reflected light from the Moon and Mars appeared significantly brighter than predicted when at astronomical opposition, giving rise to an opposition spike.The effect is particularly pronounced on regolith surfaces of airless bodies in the solar system. The usual major cause of the effect is that a surface's small pores and pits that would otherwise be in shadow at other incidence angles become lit up when the observer is almost in the same line as the source of illumination. The effect is usually only visible for a very small range of phase angles near zero.
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Fisica, Astronomia
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