The Big Bang model postulates that the Universe exploded out of an infinitely dense point, but as yet what triggered the outburst is unknown. A team of cosmologists now suggest the Universe formed after a four-dimensional star collapsed into a black hole. This would explain why the Universe appears to be uniform in all directions, though the new model deviates from Planck’s observations of temperature fluctuations in the cosmic microwave background by about 4%. 

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