Quote:
Originally Posted by snp.gupta
For me Time is time, & Mass is mass. Radiation comes from astronomical bodies at many frequencies (Electro magnetic Radiation) and is measured with radiometers on COBE, WMAP or by any ground/ parachute based instruments practically. Some total Curvature of universe may not be required here.
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GR is a theory of gravity. That gravity curves space in the vicinity of a material body. As the sun is quite heavy, we could assume curved space around us, very small curvature but measurable.
We could see this behavior in the CMBR pictures, if our own galaxy wouldn't have been removed. The very fact, that we could see our galaxy in such a picture would rule out the big bang explanation, because our galaxy isn't supposed to exist at such a time.
But we could see the relation between gravitation and radiation in other observations, too, since we could measure x-rays in the center of galaxies.
To say 'time is time' is not in line with relativity, what made time an aspect of spacetime - as well as space.