Re: Dark matter hides, physicists seek (Forwarded)

Joseph Lazio wrote:
"NV" == Nicolaas Vroom <nicolaas.vroom@xxxxxxxxxx> writes:


NV> This may be true in principle, the problem is that stil more
NV> visible matter is discovered at larger distances, making this
NV> assumption a less strict requirement. At solar scale the same can
NV> be said about the kuiper belt objects which make our solar system
NV> larger and larger with at galaxy type scales invisible objects.

Correct, but if you look at the mass of the KBOs, it's tiny compared
to, say, Jupiter, to say nothing of the Sun. Similarly, in the
outskirts of galaxies, one would have to look at the ratio of dark to
light matter. I don't remember the numbers off the top of my head,
but I'm certain that the ratio is substantial. In other words, a
substantial amount of unseen matter, relative to the matter that's
detected, is required. It's not clear how to make the unseen matter
out of anything with which we are familiar. If it were stars, we'd
see it. If it were hydrogen gas, we'd see it.

and there are 60 orders of size magnitude inbetween.

Richard
.