Re: question


Schoenfeld wrote:
> mmeron@xxxxxxxxxxxxxxxxxx wrote:
> > In article <1137884713.346590.95680@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "asdf" <qjohnny2000@xxxxxxxxx> writes:
> > >i'm not a physicist but have the following question:
> > >
> > >if there was a nuclear explsion light years from earth would the
> > >resulting loss of mass ( mass going to energy ).. result in a
> > >instaneous loss of gravitational pull between earth and the remaining
> > >mass ?
> >
> > No, because:
> >
> > 1) There is no loss of mass.
>
> Not necessarily. You could say that there is a loss of gravitational
> mass since some of that energy emitted is emitted as electromagnetic
> radiation and such energy cannot act as a source of gravitation anymore
> (since scale-invariant electromagnetic fields make 0 contribution to
> weyl tensors)
>
>

what types of mass have exert gravitational pull ? are photons
gravitational mass ?

.

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