"William C. Keel" wrote in message ...
[...]

The concern is that Cepheid properties might vary somewhat

[...]


Still, it's always really really good to check important conclusions
in as many ways as one can.

Bill Keel

I wonder how could Hubble come-up with a 500 km/s per Mpc value from
the same thing, which is now used to support a 72(!) km/s per Mpc?

Do you mean "really really good to check important conclusions", like
big bang and expanding Universe - concluded solely on the basis of
Hubble redshift? Like, look for other possible causes of Hubble
redshift? Like - bingo(!) - photon energy loss during progression?!

Or may be even think a little before jumping to "non-barionic dark
matter" and "dark energy" non-sensical -- idiocracy?! [Not to mention
the quark and gluon fun...]

Ah, you can't say that...

Cheers!
Aladar
http://www.stolmarphysics.com