Evidence from Big Bang nucleosynthesis , the cosmic microwave background , structure formation , and galaxy rotation curves suggests that about 23 % of the mass of the universe consists of non-baryonic dark matter , .
Only 4 % consists of visible .
Evidence from Big Bang nucleosynthesis , the cosmic microwave background , structure formation , and galaxy rotation curves suggests that about 23 % of the mass of the universe consists of non-baryonic dark matter , whereas only 4 % consists of visible .