The Big Bang theory suggests that the universe began as a hot, dense point, expanding into the cosmos we observe today.

How did everything begin? It's a question that humans have pondered for thousands of years. Over the last century or so, ...

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

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 universe ballooned wildly in size. In combination, string theory and inflation predict the cosmos to be incredibly complex on tiny scales and completely chaotic on very large scales.

In the observable Universe there are roughly a hundred billion ... But if you could imagine making a model in which the Earth was about the size of a marble, then the Sun would have to be about ...

In Big Bang cosmology, the observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth in the present day—because light (or other signals ...