Ma Wu saw that he would return to the solar system in all directions, so he once again chose a direction and jumped back to the solar system step by step.

In fact, Explorer 4 can jump back in an instant, and there are almost no restrictions on the fourth-level civilization in the four-dimensional universe.

According to the original plan, every 10 billion light years, stop and investigate.

This kind of exploration work, Ma Wu has been doing it for hundreds of years, and everything is so skillful.

The stars are still bright

The universe is still vast

The sea of stars is shining along the way

Life is everywhere

The Explorer records these civilizations and life, and there are not many third-level peak civilizations in the Great River Group of Galaxies, but Explorer 4, which has sailed 560 billion light-years, has not found a fourth-level civilization.

Of course, it is not excluded that the other party does not want Ma Wu to know that if it is a fourth-level civilization that has mastered the lifting dimension technology and microparticle robot technology, they can easily hide it.

"Captain, do you want coffee?" Austin asked, holding up a quaint clay cup.

Ma Wu shook his head: "Have a cup, cranberry juice!" ”

“OK。” Austin snapped his fingers, and a glass of cranberry juice appeared out of thin air.

Very sour, cranberry juice is more sour than lemon juice, but this acidity is just right for Ma Wu.

He took a sip of cranberry juice and flipped through Kobayashi's "Galaxy Odyssey 5", which involuntarily reminded him of his long-term memories.

"Huh?"

Ma Wu turned his head: "What's wrong?"

Austin pointed to a large group of galaxies that spanned about 600 million light-years: "This group of galaxies has just signaled a space jump. ”

Ma Wu put down the book and carefully flipped through the radar records, and indeed ten seconds ago, in the northeast lower region of this large river galaxy group, there was a brief space jump signal.

"Qingjiao, you follow this signal."

"Leave it to me." Blue Horn?? Dacai's mind moved, and suddenly Explorer 4 launched a hidden dark wave within more than 20 billion light years of the vicinity.

However, what is puzzling is that they stayed in this position for three days, but the space jump signal never appeared again.

"Is it passing by?" Ma Wu said.

"Could it be the bugs?" Austin thought for a moment and said.

Ma Wu was noncommittal: "Don't worry about this matter for the time being, just record it, and we will continue to return to the alliance." ”

"Okay, little ones, go home!" Blue Horn?? Dacai shouted.

Explorer 4 then activated the space-jumping device and jumped over the next 10 billion light-years away.

……

Not long after the departure of Explorer IV.

A spaceship appeared in this position.

[Weak spatial fluctuations...... ］

[Confirm Direction...... Do you want to keep tracking? ］

[Waiver.] ］

The ship stayed nearby for a moment, then jumped away.

The void was still so calm.

It's as if nothing had happened.

Because neither the spaceship nor Explorer IV left any traces here, not even the reflection of light, only some faint signs of spatial fluctuations, which also disappeared into the void as the two sides left.

……

Continuous jumps, after half a month.

Explorer IV came to a very empty area - the Cosmic Void.

Blue stars have existed for more than 4 billion years, but in the vast universe, humans are actually very small. At the same time, the mysterious universe also brings endless fantasies and speculations to human beings.

According to the Big Bang theory, the universe was born from an explosion at the singularity.

After the explosion, the universe underwent a long period of expansion, when all the planets had not yet formed, and clouds of gas were formed.

These gas clouds gained gravitational attraction as they grew, and then evolved into primitive stars.

The existence of cosmic holes is due to the fact that in the early evolution of the universe, celestial bodies could form faster in regions with higher densities, and celestial bodies attracted less dense matter through gravity, so that there was less matter in the originally low-density regions.

In 2015, scientists discovered a supermassive hole with a range of 1.8 billion light-years, which is 3 billion light-years away from the blue star.

The Cosmic Void and the Great Wall of the Universe are the largest beings in the cosmic structure of the four-dimensional universe.

The largest cosmic void observed by the Alliance, spanning 5.9 billion light-years, is a true dead field.

"Captain, the maximum span of this cavitary area is 2.4 billion light years, and the minimum span is 860 million light years, which is elliptical." Austin reported.

Ma Wu looked at the microwave radiation background map and the star map, which is called the cosmic microwave background.

The cosmic void region has subtle temperature variations, generally speaking, the microwave radiation temperature of the Great Wall of the universe is slightly higher, while the microwave radiation temperature of the cosmic void is slightly lower.

On the cosmic microwave radiation background map, the void area is a patch of blue, while the Great Wall of the universe is a patch of red.

Due to random variations in the expansion of the standard universe, a one-fifth region may appear in cold spots.

According to the Alliance's parallel space-time theory, the Void Cold Spot is caused by a collision between our universe and another parallel universe.

Our universe exists in its own cosmic bubble, like an atom, and there are countless other parallel four-dimensional universes in the five-dimensional space-time at the same time.

If two parallel universes collide, they may affect their interiors.

If the existence of the void in the universe is closely related to other universes, if this view is correct, then there must be countless parallel universes next to our universe.

"Examine this cosmic hole." Ma Wu is no stranger to the void of the universe, and the alliance has a lot of research in this area.

“OK。”

Dark wave scans in the past, and there is no difference between the data and the data of the alliance.

In fact, the universe is empty, but it is just a small meaning.

If two parallel space-times collide violently, it may even cause all life in the two parallel space-times to be wiped out.

Using atoms to give a chestnut, a slight parallel space-time collision is equivalent to the chemical reaction of atoms, at most it is the loss of some electrons; A serious collision is equivalent to a nuclear reaction, which is very likely to destroy the integrity of the two parallel space-times.

Human beings should be glad that the five-dimensional beings do not have this universe as "nuclear fuel", otherwise mankind would have been done by now.

"Captain, there's an anomaly."

"Pull it out."

Ma Wu carefully browsed through this data, and the more he looked at it, the more strange he felt.

Anomalous data shows that in the center of this cosmic void, there are some strange planets. Originally, according to the hollow nature of the universe, these planets should not exist here.

"The age of the planet is generally about 370~40 billion years? How is this possible?" Ma Wu was confused.

The Alliance has long calculated the age of this universe, which is about 27.6 billion years to date.

"The data isn't wrong, I've measured it three times." Austin replied with a pout.

"Weird? Blue Horn. ”

"Yes."

"Adjust the coordinates, target the ancient constellation."

"Right away."

Explorer IV opened the space door and instantly jumped near the over-aged ancient star.

"Austin took another detailed measurement." Ma Wu commanded.

“OK。”

The instruments and equipment of Explorer 4 are working, and these hundreds of ancient stars, as well as their planets, have scanned the past.