jacobnavia
[[Mod. note -- I think the author meant to say the the following two
quoted lines were writtey by jacobnavia. -- jt]]
Couldn't a symmetrical population of dead and invisible halo stars make
for the modified gravity we see?

No. The CMB also illuminates the matter power spectrum of the Universe.
That spectrum incorporates anything that generates a gravitational field.
And that spectrum analysis compares favorably with B.B. Neucleosynthesis
predictions. In other words, it includes all black holes...So looking through
better telescopes for previously unseen objects won't reveal anything not
already accounted for.

BJ