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It is an empirically established, formulated strictly in words or mathematically, stable relation between repetitive phenomena and states of bodies and other material objects in the world around. Revealing physical regularities is a primary objective of physics. A physical law is considered valid if it has been proved by repeated experiments. A physical law is to be valid for a large number of objects; ideally, for all objects in the Universe. Obviously, the last requirement is especially difficult to test. We will, therefore, somewhat confine ourselves to the following comments:

Solar Wind Laws Valid for any Phase of a Solar Cycle