well, its great feedback for my question, and thanks. now to digest it
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Quote:
Originally Posted by sjastro
If an object is defined by possessing certain properties than space-time is most definitely an "object".
The geometry of space-time is a property that can be determined by a fundamental property of light. Light will always travel along the shortest pathway. If space-time is flat, light will travel in a straight line, if the geometry of space-time is curved like on the surface of a ball, light will travel along an arc.
We can observe the bending of light as it travels through pockets of space time that are not flat, such as gravitational arcs observed in galaxy clusters or the position of stars near the limb of a solar eclipse that are slightly displaced when compared to their positions in the night sky.
Vacuum has a somewhat different connotation. The electric field around a charged particle possesses quantum properties like the particle. The energy levels of a field can be quantized like the energy levels of electrons in an atom.
A vacuum in this case is a field with the lowest energy level.
There a different types of vacuums as well. Apart from an electromagnetic vacuum there is also vacuum relating to the strong nuclear force.
Steven
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