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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