Computer simulations carried out by astronomers from the University of Groningen in collaboration with researchers from Germany, France and Sweden show that most of the (dark) matter beyond the Local Group of galaxies (which includes the Milky Way and the Andromeda galaxy) must be organized in an extended plane. Above and below this plane are large voids. The observed motions of nearby galaxies and the joint masses of the Milky Way and the Andromeda galaxy can only be properly explained with this "flat" mass distribution. The research, led by Ph.D. graduate Ewoud Wempe and Professor Amina Helmi, is published in Nature Astronomy.
I thought that was a Law?
A law or principal is a single proven statement while a theory is a collection of proven statements.
Basically, a law is how things work while a theory is why things work.
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I think it’s that Laws are proven to be true whereas Theories just have not yet been proven false.
Not quite. Laws are a single proven statement and theories are a collection of laws used to explain why something is the way it is.
The Big Bang Theory uses the laws of physics to justify it.