- #1
Ricky2357
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I found the following definition for the Hubble Radius:
The radius of the Hubble sphere (Hubble radius) is defined to be the distance from a fixed point O (center of coordinate system) of an object moving with the cosmological expansion at the speed of light (with respect to O).
Mathematically, R=c(a/da) , c=speed of light , a=a(t) is the scale factor ,t is time.
How's this definition valid since the Hubble radius as defined depends on the moving object?
The radius of the Hubble sphere (Hubble radius) is defined to be the distance from a fixed point O (center of coordinate system) of an object moving with the cosmological expansion at the speed of light (with respect to O).
Mathematically, R=c(a/da) , c=speed of light , a=a(t) is the scale factor ,t is time.
How's this definition valid since the Hubble radius as defined depends on the moving object?