Quote:
Originally Posted by xelasnave
Thinking more about the logic.
Having made such an observation why did not Hubble reach for Dark Matter to explain it..seems reasonable...in other words could he not have credited the expansion to a dark matter shell at the edge of the universe that was attracting the galaxies in an outward direction??? I simple see the conclusion of expansion although arguably a logical conclusion because of its exclusion of alternatives as not logical.
alex  |
Alex;
Its all been considered using FLRW spacetime and Einstein's field equations.
Even when they considered non-uniform distribution of present day matter (which normally leads to a singularity), it all comes out to the same answer .. a singularity.
The "If" conditions are first specified with corresponding "Then" outcomes.
The key is matching the "Ifs" with the outcomes.
Apologies if this doesn't make clear sense .. I've run out of time.
More tomorrow, perhaps.
Cheers
PS: Hubble measured the expansion. The Theory came much later .. after Fred Hoyle's theories died out.