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
