Sage-Tips

What were the theories 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.

What are the two theories of relativity?

The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity.

How did general relativity contribute to the big bang theory?

4. The Big Bang Theory. General relativity says that when spacetime stretches around a massive object, the light travelling through that spacetime stretches too. So light that starts out one colour ends up a slightly different (longer wavelength) colour after travelling through stretched spacetime.

What is the theory of general relativity in simple terms?

What is general relativity? Essentially, it’s a theory of gravity. The basic idea is that instead of being an invisible force that attracts objects to one another, gravity is a curving or warping of space. The more massive an object, the more it warps the space around it.

What are the two theoretical pillars of the Big Bang model?

The Big Bang theory offers a comprehensive explanation for a broad range of observed phenomena, including the abundances of the light elements, the CMB, large-scale structure, and Hubble’s law. The theory depends on two major assumptions: the universality of physical laws and the cosmological principle.

How does general relativity predict the expansion of the universe?

One of general relativity’s most striking predictions arises if we consider what happens to the universe as a whole. They argued that the universe should start off small and dense, and expand and dilute with time. As a result, galaxies should drift away from each other.

What are the examples of general theory of relativity?

For example, an observer will see a ball fall the same way in a rocket (left) as it does on Earth (right), provided that the acceleration of the rocket is equal to 9.8 m/s2 (the acceleration due to gravity at the surface of the Earth).

What is authenticated Einstein’s theory of relativity?

Albert Einstein, in his theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels, according to Wired.

Did space and time exist before the Big Bang?

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?

What is the Big Bang theory?

This is the Big Bang theory. A universe popping into existence out of nothing is so bonkers that scientists had to be dragged kicking and screaming to the idea. But the evidence is compelling. The galaxies are flying apart like pieces of cosmic shrapnel. And the heat of the Big Bang is still around us.

What is the Big Bounce theory of the universe?

They believe that instead of a Big Bang, the universe expands and contracts in a cycle, bouncing back each time that it shrinks to a certain size. In the Big Bounce theory, each cycle would begin with a small, smooth universe that wouldn’t be as tiny as the singularity.

When did the universe converged to a single point?

When we extrapolate backward the entire part of the universe that we can observe today was converged to a single point around 14 billion years ago. Time is a concept that works great in our daily life but there are limits to it. Even here on earth GPS satellites would be off within a day without corrections from special and general relativity.