Locally bound galaxies within a group may be traveling towards each other. Where the gravitational attraction force exceeds the expansion. Expansion is related to the distance one goes so eventually expansion exceeds any gravitational attraction, hence Red Shift
The Universe has no centre from which it expanded. The notion of space and hence any coordinate system based on what we call space only came into existence at the moment of creation. Space is still being created but it is only referenced (the expansion that is) to every other bit of space out there
Thanks for your replies but I don't agree or else there are other things to be answered here.
If you say -E(-t) = E(t) then how can this be. Energy is a scalar quantity so should have no direction which would seem to be implicit with the equation quoted, Energy reverses with negative time
Also...
I don't understand why the spin angular momentum component and contribution to energy equation, in pairs of particles created in pair production, seem to be conveniently ignored
I would like people's opinions on why the negative energy solutions of Dirac's Relativistic Wave equation were simply ignored in 1934 to make things fit. Another related question is with the energy conservation laws as they stand. Why in pair production from a photon at 1.022MeV forming a...