The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time, because ...

The observable universe — the portion we can ... to statistically analyse all measurement results to estimate the universe's ...

"The observable universe is only that part of the universe ... when the universe was smaller. "Now, the total size in each ...

It all started with a Big Bang – and now scientists are on a quest to unravel the mystery behind the birth of the universe.