Novel method puts a number on universe's matter and energy :

A new study uses the innovative mass-richness relation technique to determine that 31% of the universe is made up of matter.

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Japan , Tomoaki Ishiyama , Mohamed Abdullah , Egypt Chiba University , Dark Energy , Chiba University , National Research Institute Of Astronomy , Sloan Digital Sky , Dark Energy Spectroscopic Instrument , National Research Institute , Subaru Telescope , Dark Energy Survey , Euclid Telescope , James Webb Space , Cosmos , Energy , Matter , Universe , Ass Richness Relation ,