Is a static universe possible?
In cosmology, a static universe (also referred to as stationary, infinite, static infinite or static eternal) is a cosmological model in which the universe is both spatially and temporally infinite, and space is neither expanding nor contracting.
Does the universe stay still?
The universe encompasses everything in existence, from the smallest atom to the largest galaxy; since forming some 13.7 billion years ago in the Big Bang, it has been expanding and may be infinite in its scope.
Is universe unstable?
Brian Cox says universe ‘isn’t as stable as we believe’ in 2017. A true vacuum is the stable, lowest-energy state, while a false vacuum suggests the universe is somewhat, but not entirely, stable – known to scientists as “metastable”.
Did Einstein say the universe was eternal?
It was a prejudice of the time that the universe was constant and eternal, forever unchanging — at least on the largest levels. This led Einstein to add a term to his initial equations in 1917. That is, the universe was not static.
How can the universe be infinite if it started expanding?
How can the universe be infinite if it started expanding 13.8 billion years ago? If the universe is infinite, it has always been infinite. At the Big Bang, it was infinitely dense. Since then it has just been getting less dense as space has expanded. Imagine a large flat rubber sheet with sand placed as closely together as possible on the sheet.
How much of the universe can we see?
The universe may be infinite, but we can only see a finite section of it due to the finite speed of light. We can only see those parts from which light has had time to reach us since the beginning of the universe – which means we can (in theory) see a spherical universe with radius of about 47 billion light years.
Is the observable universe finite or 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 observable universe is centred on us.
Could the universe have had a bounce instead of a bang?
With a bounce rather than a bang, Steinhardt says, distant parts of the cosmos would have plenty of time to interact with each other, and to form a single smooth universe in which the sources of CMB radiation would have had a chance to even out. In fact, it’s possible that time has existed forever.