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gegenschein
Gegenschein ((:ˈɡeːɡənʃaɪn) German for "countershine") is a faint brightening of the night sky in the region of the antisolar point.
== Explanation ==
Like the zodiacal light, the gegenschein is sunlight backscattered by interplanetary dust. Most of this dust is orbiting the Sun in about the ecliptic plane, with a possible concentration of particles at the Earth–Sun Lagrangian point.
It is distinguished from zodiacal light by its high angle of reflection of the incident sunlight on the dust particles. It forms a slightly more luminous, oval glow directly opposite the Sun within the band of luminous zodiacal light. The intensity of the gegenschein is relatively enhanced, because each dust particle is seen in full phase.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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