cosmology - Why is the ratio dark matter / normal matter bigger today than in the past? Is it the dark matter that increased or the normal matter that decreased? - Physics Stack Exchange
The Dark Universe
3. A pie chart of the content of the Universe today. Credit: NASA/WMAP... | Download Scientific Diagram
Unsolved: Dark Matter and Dark Energy | MrReid.org
A Billion Tiny Pendulums Could Detect the Universe's Missing Mass | NIST