Differential inflow

A common objection to the toroidal model concerns blueshift, the shortening of light's wavelength from objects moving toward us. If we are on the Inhale, it seems we should see the universe closing in on us. Yet blueshifted galaxies are scarce.

In RSI the overall redshift of distant galaxies is not a motion at all. It is the comparison of clocks described in Chapter VI, so it says nothing about whether galaxies approach or recede. Their actual motions through the medium show up only as small Doppler shifts on top of it, of hundreds of kilometers per second.

RSI proposes that differential inflow shapes these motions. The large-scale pressure gradient steepens toward the Still Core, so galaxies nearer the core fall faster than those farther out, much as objects nearer a planet fall faster than those farther away.

Galaxies ahead of us are moving toward the center faster than we are, so the distance between us grows even though we share a destination. The coherent motion shows up in the Bulk Flow, the unified migration of our neighborhood toward the Great Attractor. The theory compares this to a convoy whose leading vehicles outpace the trailing ones as the slope steepens toward its source.