Did the big bang really happen?
来源：未知 作者：翟锲 时间：2019-03-15 02:16:02
By Marcus Chown WHAT if the big bang never happened? Ask cosmologists this and they’ll usually tell you it is a stupid question. The evidence, after all, is written in the heavens. Take the way galaxies are scattered across the sky, or witness the fading afterglow of the big bang fireball. Even the way the atoms in your body have come into being over the eons. They are all smoking guns that point to the existence 13.7 billion years ago of an ultra-hot, ultra-dense state known as the big bang. Or are they? A small band of researchers is starting to ask the question no one is supposed to ask. Last week the dissidents met to review the evidence at the first ever Crisis in Cosmology conference in Monção, Portugal. There they argued that cosmologists’ most cherished theory of the universe fails to explain certain crucial observations. If they are right, the universe could be a lot weirder than anyone imagined. But before venturing that idea, say the dissidents, it is time for some serious investigation into the big bang’s validity and its alternatives. “Look at the facts,” says Riccardo Scarpa of the European Southern Observatory in Santiago, Chile. “The basic big bang model fails to predict what we observe in the universe in three major ways.” The temperature of today’s universe, the expansion of the cosmos, and even the presence of galaxies, have all had cosmologists scrambling for fixes. “Every time the basic big bang model has failed to predict what we see, the solution has been to bolt on something new – inflation, dark matter and dark energy,