Did space and time exist before the Big Bang?
The initial singularity is a singularity predicted by some models of the Big Bang theory to have existed before the Big Bang and thought to have contained all the energy and spacetime of the Universe.
What was space like before the Big Bang?
It’s possible that before the Big Bang, the universe was an infinite stretch of an ultrahot, dense material, persisting in a steady state until, for some reason, the Big Bang occured. This extra-dense universe may have been governed by quantum mechanics, the physics of the extremely small scale, Carroll said.
Why can’t we go back to the past?
The Novikov self-consistency principle, named after Igor Dmitrievich Novikov, states that any actions taken by a time traveler or by an object that travels back in time were part of history all along, and therefore it is impossible for the time traveler to “change” history in any way.
Why is time the 4th Dimension?
Moving through space necessitates you to move through time as well. Hence, they argue that time is the 4th dimension since without it, we cannot construct any meaningful position vector with an unchanging length. Time’s dimension is a line going from the past to present to future.
Is the universe actually infinite?
The observable universe is finite in that it hasn’t existed forever. It extends 46 billion light years in every direction from us. (While our universe is 13.8 billion years old, the observable universe reaches further since the universe is expanding).
The statement that space and time did not exist prior to the Big Bang appears to present a logical impossibility, at least with respect to time. Any physical event implies change, and change presupposes — or would logically require — the existence of time. Or not?
Does time exist outside of our universe?
Similarly, time, far from being eternal, is just a property of our universe. It is possible to construct hypothetical universes that are logical and self-consistent, with no time at all, or with more than one time. So outside of our universe, time has no meaning. “Before the Big Bang” would be, by definition, outside of our universe.
Is the Big Bounce a big bang or Big Bang?
The Big Bounce would make a departure from western civilization’s view of reality since St. Augustine, because it would recognize that time actually existed before the universe as we know it. But whether it as a Big Bang or a Big Bounce, the question of what existed before our present universe remains an open question.
What can we learn from the early universe?
The observational go-to for early universe cosmology is the Cosmic Microwave Background (CMB), which represents an imprint of the earliest time we can see. It’s believed that the CMB will contain information from earlier times, including the big bang (if it happened).