Those clever scientists were able to work out that the gravitational effects felt all over the universe didn't seem quite right, as if there was a big "something" we were missing. This "something" is referred to as Dark Matter. It's a bit of a running joke, as nobody seems to have any idea what or where it is, how to find it, and how to make physicsy things seem believable when they themselves don't even understand!
This site reports that the ever elusive dark matter may have been found. Well, the effects that dark matter may produce. There's an observatory up there called PAMELA who's team say they've "observed more positrons than can be explained by know physics", and this matches up with what they think dark matter should produce.
And this, this is why I like physics. Nothing is set in stone. Every theory is based upon other theories based upon assumptions taken from yet more theories. Take gravity for example. We all know it exists, we're all here, stuck to the ground and not floating away into the black. Einsteins theory of general relativity is generally taken to explain gravity, when something is big. If it's small, and I mean smaller-than-small small, then general relativity doesn't work. You need to use quantum mechanics to explain the interaction of small things and gravity. However, GR and QM don't like each other. Read here for more.
This is one thing I seem to have left off my list. I do like astronomy and astrophysics, I even have myself a shiny computerised telescope (the 70mm version). Though I can talk about physics I am merely an armchair-astronomer/physicist, so I may (and probably will) make mistakes from time to time. So please, feel free to correct me.
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