Cosmologists in the shower time travelers. Looking back billions of years, these scientists are able to follow the evolution of our universe in amazing detail. 13.8 billion years ago, there was a Big Bang. After a fraction of a second the universe expanded exponentially – in a short period of time, called inflation.
During the following periods the space has grown to enormous size, we do not even see the edges. But how can this be possible? If the speed of light marks the cosmic speed limit as there may be regions of space-time, the photons which are beyond our reach? And if they exist, how do we know of their existence? This question is answered with Vanessa Janek Universe Today.
The Expanding Universe
Like everything else in physics, the universe tends to exist in the lowest energy state possible. But after 10 -36 seconds after the Big Bang, according to inflationary cosmology, space was in the false vacuum energy – the lowest point, which really was not the lowest. In search of the true nadir vacuum energy, a split second later, the universe inflated by a factor of 1050. Since the universe continues to expand, but at a slower rate. Read the rest of this entry »