Quote:
Originally Posted by Archy
To Steven
On a final note: You say space-time is affected by density, that the earth does not curve space-time and, I infer, that the precession of mercury shows the sun's effect on space-time.
How can you explain these views when the sun's density is 1.4 g/cm3 (Namowitz, Samuel N. Heath Earth Science. Canada: Heath, 1994: 379. "… Sun's density is 1.4 times that of water.)
and the Earth's density is 5.519 g/cm3 (Neff, Robert F. & Zitewitz, Paul W. Physics, Principles and Problems. New York: Glencoe, 1995: 159. "Mass of the Earth 5.979 × 1024 kg Radius of the Earth 6.3713 × 103 km)
The sun curves space-times more than the earth because it is more massive, not because it is denser.
|
The answer is obvious.
The Sun's density of 1.4 g/cm3 is an
average density.
The density of the core is
150 g/cm3 which is why space time curves at the Sun. It has nothing to do with mass.
Stars of 15 solar masses or more require the thermonuclear reactions to keep their
cores from collapsing under gravity.
If the core does collapse a supernova occurs and the core forms a super dense neutron star or black hole with the corresponding space time curvature.
The mass of a neutron star is much less than the original star but the density is millions of times greater than the average density of the original star.