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Originally Posted by Archy
Steven
Re: "Space time is effected by density not mass."
There are two contradictions:
First: Having said: Since the Earth is not sufficently massive to cause space-time to curve.... " you then say it's not mass it's density." you then say it's not mass it's density.
Second: "Space time is effected by density not mass" is self contradictory as density is a function of mass.
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By mentioning the planet Earth I have automatically defined.
(a) It's mass
(b) It's diameter (or volume)
The statement "
Since the Earth is not sufficently massive to cause space-time to curve.... " should therefore be self evident.
In other words the Earth is not sufficently massive
for it's diameter (or volume) to cause space time to curve.
Density=mass/volume. If volume is constant, then density is purely a function of mass. Increasing mass increases the density which may cause space time to curve.
Hence there is no contradiction.
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Finally, where is the proof that density effects (ie causes) space-time?
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Neutron stars have solar masses around 1.3 -2.1 where as the progenitor stars before becoming supernovas are 15 solar masses or more.
Neutron stars can form gravitational lens due to space time curving. 15 solar mass stars do not. This is because the density of Neutron stars is very much greater.
Steven