<p><pre><code> [...] an expanding wave with its epicenter near the Earth could
produce the dimming effects the two teams had observed [...]
</code></pre>
This is not science, it's geocentrism that borders on implicit mysticism. It not only violates the Copernican principle, it also introduces a needlessly more complex model into a place where the simpler explanation was doing just fine without any appropriate justification for doing so.<p>There is a good reason why we say "<i>all other things being equal or held constant</i>" until evidence suggests otherwise.<p>As a model, this shockwave hypothesis draws its only reason for existing from the apparent willingness or need to put humans at the center of the universe, with all the consequences it implies. It's baffling that given all we know today, there are still a lot of supporters for hypotheses putting the Earth at the center of everything, but for some reason I can't find a single one that is based on, say, galaxy cluster Abell 2744 being the most important point in space.