The science of humans has crossed an epic path to measure the calmness of the universe. Today, we know about 93 billion light-years in the universe worth watching. But the question is, how did people measure such an infinite expansion sitting in this small corner of the world? Behind this huge number lies a complex story of light, time, stretch and human unrelenting curiosity.

First, scientists learned to understand the light of the universe. It takes time for the light of the far star to reach us, and at that time, the measure of distance is in light-years. But people still didn’t know whether the universe is stable or running. Until Edwin Hubble tested the lights of the galaxies in 1929, their lights were moving red, which means they are moving away. This discovery brought the universe alive before people for the first time—an expanding universe.

And then comes another surprise: Cosmic Microwave Background (CMB)—the thin temperature after millions of years after the birth of the universe. This is like an ancient echo of childhood in the universe. Looking at this radiation equality, density lift and wave design, scientists realise the universe was once unimaginably small and expanded at an astonishing pace, called inflation.

Now the real secret place. Scientists knew we were top 13. Can see 8 billion years of light journey. So the diameter of the universe is 2×13. 8 = 27. It should be 6 billion light-years. But no, the universe continues to expand. No matter how far the journey of light comes, the path itself gets longer with time, as if someone is pushing the horizon further. The speed of this stretch is not like normal speed—it’s a structure stretch, with no limits. So there is light 13. Coming up for 8 billion years, its source has gone far from that place today—about 46.5 billion light-years away. As a result, the overall bass was caught 93 billion light-years.

It’s a strange feeling as if we’re staring at ancient pictures of the universe, but the photo frame itself is running towards the horizon. We see the past with light, but she has gone beyond the present by order. So today’s universe is far greater than the light of its own birth.

People understood in very simple language: as far as we see, the limit is not our “horizon” universe, but our observation. The universe is probably far, much bigger than this. But the light is still on the way, so we can’t see the bottom.

Thus, a wonderful number was born out of the intricate dance of light, time, space and expansion—93 billion light-years. This number is not human arrogance, but a humbling perception we can understand small, but limitless in the power of curiosity. The universe may not catch our eyes, but the human brain has the ability to touch its scope, that is, the most beautiful light of civilisation.