On 10/11/2012 9:41 AM, Richard Ruquist wrote:

Brent, According to Einstein it takes massive objects to warp spacetime.

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`No, that's wrong. Mass-energy warps spacetime, but the Einstein equations have non-flat`

`solutions with a zero stress-energy tensor. DeSitter showed this shortly after Eistein`

`published.`

Therefore a warped spacetime cannot be empty. The apparently flat spacetime that exists

The spacetime of this universe is not flat, only the space part is.

is due to dark energy, dark matter and visible matter. Although flat, it is hardly considered to be empty.

`Nobody said it was empty. I was just correcting your misconception that spacetime had to`

`be flat in the absence of matter.`

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