How big is the universe and what is beyond the stars?
The Universe's Dizzy Edge
How big is the universe and what is beyond the stars?
Here is a question that has been keeping humans up at night for thousands of years: how big is the universe? The honest answer is going to sound like a joke, except it isn't. The universe is so big that the word "big" gives up halfway through trying to describe it. So let's start small, and keep climbing, and see how dizzy we can get.
Start with the fastest thing there is: light. A beam of light could zip around the whole Earth seven and a half times in a single second. That's our speed champion. Nothing beats it. Hold on to that, because we're about to use light as our measuring tape.
