On Fri, Nov 29, 2013 at 6:18 AM, Telmo Menezes <te...@telmomenezes.com>wrote:

> why is it assumed that this phenomena is caused by some type of matter?
> [...] and I'm worrying too much about the word "matter"...

Observations of the Bullet Cluster indicate that whatever this dark stuff
is it has inertia and moves much more slowly than light, so it must have a
rest mass and it must both produce gravity and be effected by it. To a
physicist anything that has those properties is matter even if it's dark,
that is to say you can't see it because it is not effected by
electromagnetic waves.

  John K Clark

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