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'Does the universe have boundaries?'

'If so, what lies beyond the border?'

This is a question that many astronomers and even the general public on Blue Star have always been curious about.

Most people know that the universe has been expanding faster than the speed of light, and it is accelerating every moment.

This means that even if you continue to travel in a certain direction at the speed of light, the expansion of the universe will reach farther areas before the traveler.

Therefore, there will always be a point that voyagers can never reach. This point, by extension, is the so-called boundary of the universe.

In the understanding of most life forms in Blue Star Civilization, the universe in a general sense is the 'Hubble volume' - the observable universe.

That is, it refers to a spherical space-time with a blue star as the center, a radius of 46.5 billion light years, and a diameter of 93 billion light years.

All galaxies that humans have discovered from ancient times to modern times and in the future, as well as all the galaxies that may be discovered, exist in it.

Of course, there may be a large number of galaxies outside this area.

But the light they emit will never reach the blue star due to the expansion of the universe, and will not be observed by blue star beings.

Therefore, the universe 46.5 billion light-years away is collectively called the unobservable universe.

However, the above concepts are only a superficial understanding of the beings of Blue Star Civilization.

At least in the memory of the Hungry God clan, the true 'geography' of the universe is not like this at all.

The 'River of Realm' they knew spread across the starry sky...far beyond the so-called observable universe.

In the conventional understanding of Blue Star sentient beings, the universe is composed of a bunch of galaxies, galaxy groups, galaxy clusters, and super-galaxy clusters floating around in the east and west.

A long time ago, Mu Cang thought so too.

But this is not the case in the memory of the Hungry God clan.

First of all, there are never absolutely immovable celestial bodies or things in the universe.

Whether stars, planets, neutron stars, black holes or sparse interstellar dust, they are always in motion.

Even larger celestial structures such as the Milky Way, the Andromeda Galaxy, and the Triangulum Galaxy are also moving regularly.

This movement of galaxy-level celestial bodies is called ‘primary motion’.

This chapter is not finished yet, please click on the next page to continue reading the exciting content! At first glance, the intrinsic motions of many galaxies in the universe seem to be chaotic and irregular.

But when the number of galaxies is large enough and you observe it, you will find that the intrinsic motion of many galaxies is not random motion.

They are all constantly moving in a certain direction.

At the scale of the Milky Way, the star system is the basic structural unit.

If you step outside the Milky Way and stand on a higher scale, galaxies like the Milky Way are the basic structural units.

But on a cosmic scale, only galaxy clusters and even superclusters like Laniakea are qualified to become basic structural units.

Galaxy clusters and supergalaxy clusters with huge masses will naturally 'press' the vast space-time structure around them, forming huge gravitational fields.

Galaxy clusters with huge gravitational fields will influence each other, and over time they will form even larger and more terrifying gravitational fields.

This level of huge gravitational field will cause many galaxy clusters and superclusters to form extremely complex motion trajectories in a larger range of cosmic space.

In these complicated motion trajectories, many galaxy clusters sometimes gather together to form superclusters or larger and looser galaxy composite structures.

Sometimes many galaxy clusters are scattered in the universe to form empty areas with sparse matter, that is, cosmic voids.

More often, huge gravitational fields will 'drive' large numbers of galaxy clusters to move in a certain direction like the undercurrent beneath the blue star's surface, with a majestic flow measured in hundreds of millions of years.

This super astronomical phenomenon involving billions of galaxies spanning tens to tens of billions of light-years is the undercurrent of the universe.

At the same time, in the memory of the Hungry God clan, there is far more than just one undercurrent in the universe, but there are thousands or even tens or millions of them.

Just like the rivers on the blue star will eventually gather into the sea, these undercurrents spread across various regions in the vast universe will also gather and condense under the influence of gravity.

And the ultimate structure formed by these countless huge cosmic undercurrents intertwining with each other is the ancient river of gravity.

The so-called observable universe that Mu Cang knew and knew before is being penetrated, surrounded and spread by a huge and boundless ancient river of gravity.

This ancient river is the river of Jie Yuan.

And in the memory of Xiu, the King of Gluttony, the starry sky affected by the River of Realm is far more than just the observable universe.

Its spreading space-time range may... exceed 200 billion light-years.

Even judging from Xiu’s exchanges with some cosmic antiques that are tens of millions of years old.

The river of Jie Yuan may not be the only ancient river of gravity in the universe.

Besides this river, there may be several or even more other ancient rivers.
Chapter completed!