Originally posted by DarthWang
So gut a Leviathon and put one inside, then send it at the Sathanas.
They didn't send one against the first Sathanas because by the time they had gutted a Leviathan, installed a Meson bomb and sent it in the Sath the events of High Noon had already occured. Gutting a Leviathan is a big task. (And that's assuming that it wouldn't fail for any of the other good reasons stated elsewhere on the thread).
I'll bet that the Command refitted the Bastion and Nereid soon after the first Sathanas came though as a fallback plan.
It's also worth pointing out (yet again

) that the Meson is experimental and they may not have the huge numbers of them that people are assuming exist.
The Sathanas fleet is described as having surrounded Capella. In the outro we only see about 10 or so Saths so it seems likely that they had arranged themselves in maybe 8 clumps in different places around Capella.
We already know that a single meson bomb isn't sufficient to take out a Sathanas and the Saths are spaced out sufficiently that the explosion of a meson bomb near one Sath won't affect the others.
So to take out the Sathanas fleet we'd need a co-ordinated attack at maybe 8 different places, using 160 terran capships or so which have been gutted and filled with an experimental weapon which have been produced in mass numbers in the day or so since Command learnt of the existance of the Sathanas fleet.
Or they could realise they're f**ked and just blow up the EP and Vega nodes with the probably pre-prepaired Orions.