Explanation on dark matter: something to throw at your players

[yukonhorror]

http://www.phdcomics.com/tv/

There is a little movie explaining dark matter. It is really good and quite interesting. If you want to throw something at your would-be adventurers that has mass (gravitational pull), but can't be felt or seen, well here you go.

There is also the light bending thingy that creates multiple images of the same thing. REALLY throw them off.

[Utgardloki]

I've long been thinking of many uses for dark matter:

1. I've been wanting to do a campaign set on a Big Dumb Object, probably some sort of ringworld. But I have an idea to use dark matter to reinforce the structure by essentially providing the equivlant of pilings to support the super long arch.

2. I've been thinking of a world where there is a dark matter power reactor that operates inside the planet, generating large amounts of power that is practically undetectable, but able to effect things on the planet.