for National Geographic News
Published March 10, 2010
"The theory of gravity proposed by Albert Einstein nearly a century ago can explain the dance of galaxies around one another just as well as it can model the motion of planets around the sun, according to a new study."
That Albert fellow was one pretty sharp cookie, huh?
If you have never heard of Dark Matter or Dark Energy, I would recommend you at least do a once-over to get an idea of what they are. It would be well worth your time.