the visible stars. The mass density at the current time was assessed by WMAP to be Ω m,0 = 0.27 +/- 0.04. The By making observations of fluctuations in the cosmic microwave background (the ‘leftover’ radiation from the Big Bang), astronomers have shown that the Universe is ‘flat’. This yields a total mass of the visible matter of about 6e51 kg (1.3e52 lb), which is equivalent to the weight of 4e78 hydrogen atoms. 24% Cold Dark Matter. Scientists studying cosmology measure the expansion of the universe and its density to determine its shape. Wikipedia entry on Once the universe stops expanding, it will begin to contract. The geometry of the universe is often expressed in terms of the "density parameter", which is defined as the ratio of the actual density of the universe to the critical density that would be required to cause the expansion to stop.

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