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WMAP shape of the universe

According to data received from the WMAP (Wilkinson Microwave Anistropy Probe), the shape of the universe is 'flat' (as opposed to 'open' or 'closed') as the microwaves from the first light received are not distorted. If the universe is flat (and because luminous & dark matter only constitute 27% of the critical density) a dark energy is postulated to make up the remaining 73% of the critical density. Source- More info/explanation of dark energy-
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