How big was the universe one second after the Big Bang?

There is no way to find out if there even was a universe before , therefore no one knows the answer on your question. We don't even know how big...

It is theorized that at the moment of energy was contained in a singularity which means there is no space-time.

The Universe (as we know it) did not exist before and it was a singularity. (here the laws of physics are indeterminate). The Universe came into existence at Planck time...

As I understand now, it was speeding out of matter, from a point source, at the speed of light, with consequent formation of the systems of our universe,...

Not to oversimplify this but the very nature of "theory" means that an absolute proof does not exist. In the case of the development of the early universe, it will...

Even determining "facts" is a difficult, on-going process, with many errors along the way. BUT, the point of the "Scientific Method" is to KEEP questioning and looking for supporting EVIDENCE,...

This is a question that still lies outside of our knowledge, and may always continue to do so. Physics today can do a creditable job of outline the events that...

Edwin Hubble found that the galaxies have red shift indicating their movement away from Us.. and expansion.Now observation of Type 1a supernova as standard candle found that the universe is...

Suppose you had a metre stick and a stopwatch, you could measure the speed of an object by dividing distance by time, right? (Admittedly you may need a large stick...

The Big Bang means that the Universe evolved from a singularity and the Universe is inflationary, it being finite and unbounded, Einstein had originally postulated the need for a cosmological...