Joule/m^3

space represent cubic meter

Joul represent Light

Exist Light in SPACE = Exist Joules / m^3

Joules/m^3 = N*m/m^3 = N/m^2 (pascal )

preasure in closed tank is the same

what about Light inside closed tank

WHAT IF TANK IS VERY BIG !!! OCEAN ?

p1...p2...p3...p4...star >>> motion

in space we have star

star is young and strong ( almost constant Joules/sec )

star was in past in point p1 ...p2...p3...p4 ...

star is right now in point p5

star will be in point p6

Light and Preasure is rising isotropy C speed respect to

point where signal started

how FAR FROM PLACE WHERE SIGNAL STARTED

astronomers WILL REGISTER LIGHT ?

Earth ------------SUN-------------Earth >>> 20 km/s

why we have winter summer ?

where Sun started light and how far from this point Earth will register Signal !!?

INVERSE SQUARE LAW

More far from place where signal started = lower intensity of signa

l ( "lower brightness" lower Joules/ mm^2

Smmer ? winter ? ) 1R = X , 2R = X/4 , 3R = X/9

X- brightness, R- radius

the same energy portion but different area