https://blogs.mercola.com:443/sites/vitalvotes/archive/2003/10/30/Dark-Matter-and-Dark-Energy.aspxEverything we're made of or can measure - from atoms to energy - is only 4 percent of the whole shebang. The rest is dark matter (about 23 percent) and, best of all, dark energy (73 percent). How do we know this? We can thank the Wilkinson Microwave AnisotropyenCommunityServer 2008.5 SP1 (Debug Build: 31106.3070)