On 12/2/2013 10:19 PM, LizR wrote:
On 3 December 2013 11:55, meekerdb <meeke...@verizon.net <mailto:meeke...@verizon.net>>
On 12/2/2013 1:14 PM, LizR wrote:
On 2 December 2013 20:14, meekerdb <meeke...@verizon.net
On 12/1/2013 7:35 PM, LizR wrote:
On 2 December 2013 16:16, Richard Ruquist <yann...@gmail.com
MOND is an alternative explanation that replaces Dark Matter by
Yes (hence the flippant remark about bolt on extras)
Dark Matter results when gravity is not modified. (pure Newtonian)
Or rather Einsteinian, I don't think Newtonian gravity predicts
Sure it does, but only half as strong as GR.
Ah yes, that's right. I believe that's why the 1919 eclipse data is actually
somewhat equivocal, despite catapulting Einstein to fame. (And someone
black holes way before Einstein, too, on the basis of Newtonian gravity and
measurement of c - although without realising the full implications ...
Mind you, I think my correction above is still pertinent - that is, it's
truer to say that "dark matter is what results when gravity is not modified
Dark matter would be implied by the same observations even assuming
gravity. Just the amount would be different. I don't know if Fritz Zwicky
used relativistic calculations of rotation curves of galaxies to infer dark
it wouldn't have been necessary since the motions are not that fast.
Incidentally I met Zwicky at a party once and he regalled me with the story
he and a NACA team had actually beaten the Russians into space by launching
artificial satellite *before* Sputnik. When I expressed surprise that I
heard of this satellite, he explained that it was launched from a B-50
50kft over the equator using a two stage rocket. When the second stage
apogee, it fired a shaped charge which sent a molten mass of metal into
We were both a little drunk, but he was serious. I asked if the blob of metal had been
tracked in orbit? Zwicky said it was too small to track by radar. So then I asked how
they knew it entered orbit. He said they knew because telemetry from the second stage
rocket showed that it had fired the shaped charge at the right altitude and right direction.
I had not recalled this for many years; the party was in 1963. Consulting the internet
(which remembers everything, many of which actually happened) I find that Zwicky wrote a
paper about these experiments which differs somewhat from my recollection.
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