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physical phenomena > event > atomic process > collision > scattering > backscatter

backscatter
subject			fact

backscatter	has definition Scattering of radiation (or particles) through angles greater than 90° with respect to the original direction of motion.
	is a kind of scattering
radiation direction modification	changes property direction
atomic process	has domain atomic physics
event	has duration
	has synonym world point
	has time of occurrence

Kinds of backscatter :

• gegenschein (5 facts) (counterglow) - Faint oval patch of light visible from Earth only at certain times of the year, opposite the Sun. Its nature and cause are still not known. It is sometimes known as "counterglow"., A very faint glow (about 10° across) which can occasionally be seen in a part of the sky opposite the Sun., Faint nebulous light about 20° across near the ecliptic and opposite the Sun, best seen in September and October. Also called counterglow.