In the former half of the twentieth century, it was believed that: 379000 years after the big bang, all mater was uniformly distributed in the fabric of space time. This finding led physicists and mathematicians to great dilemma because this finding was not in accord with the Big-bang theory.
In 1992, measurements made by NASA’s cosmic background explorer ( COBE) satellite revealed that the background radiation is in fact not enough perfectly uniform, i.e. , the masses were not evenly distributed in the space after 379,000 years of Big-bang, but was uniform in before some certain time in the past. Later in 2003, another experiment by NASA’s Wilkinson’s Microwave Anisotropy Probe (WMAP) confirmed firmly that the Universe was uniform and the theory of Big-bang is accurate and true.
physics for scholars 