Abstract
The Soviet physicist Lev Landau once remarked that “cosmologists are often in error but never in doubt”, referring to the gulf that has existed historically between theory and fact in the field of cosmology. However, new results from the Wilkinson Microwave Anisotropy Probe (WMAP) that were unveiled last month should put paid to such a view. By making the most precise measurements ever of the cosmic microwave background – the faint radiation left over from the Big Bang – the NASA satellite has confirmed cosmologists' current understanding of how the universe formed and what it is made of. The satellite's data also reveal that the first generation of stars was created much earlier than previously thought.
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