Ahad radius - The edge of solar flux prevalence

[Javid]

On any interstellar journey going outward from our solar system, one eventually reaches a point where the total amount of light received from our Sun is exactly matched by the total amount of flux coming from all cosmic sources external to our solar system. The heliocentric distance of that boundary is dubbed the "Ahad radius", and exists at the edge of the "Ahad sphere of solar illuminance", some 11,500 astronomical units (roughly a trillion [10^12] miles) from Earth.

On first definition of this heliocentric boundary, Abdul Ahad wrote:-

"Beyond the outer edges of this theoretical sphere, the feeble currents of light coming from its core (i.e. our own distant Sun) will cease to make any noticeable ripples in the calm waters of the surrounding cosmic ocean..." - July, 2004.

Here's a fact:-
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To this day, no man made spacecraft has ever gone beyond the Ahad sphere of solar illuminance. At its current speed of 3.6 AUs/year, Voyager 1 will be crossing the Ahad radius in about 3,200 years from now!