>>http://www.physorg.com/news167555163.html
>
>I don't believe in Dark Matter.
>
>I believe gravity is stronger not because of invisible matter, but because galaxies aren't really as far apart as we think, because we think space is expanding but it isn't.

There is much more evidence for dark matter.

There is the rotation within the galaxies themselves - including our own galaxy - it rotates much faster than it should, for the known mass. Of course you might claim that distance within our galaxy aren't well-known either.

There is the evidence from gravitational lensing.

And a few other things which I didn't investigate in detail. For example, the Wikipedia article (on dark matter) mentions "the temperature distribution of hot gas in galaxies and clusters of galaxies" - I am not sure what the reasoning is, behind this.

About the expansion of space... There is even more evidence for that. For a start, the so-called redshift, which is hard to explain in any other way. Then there is the cosmic background radiation, and lots of calculations that indicate that a static universe can't be stable. Problems with entropy, for a start - it just doesn't work.