Lifespan was a hurdle that interstellar travel had to overcome. Human Civilization had advanced constantly along its journey, and reaching its current level already counted as living as long as heaven itself compared to the Earth Era.
But to Human Civilization at its present stage, its scientists still were not satisfied with the status quo, because against the vast universe, ten million years was only an instant. What they wanted was a life with endurance as long-lasting as Yue Yuan's, so research into the Negative Entropy Factor continued.
The universe was so vast. Traveling at 2,770 times the speed of light, even measured by the current diameter of the observable universe, if Human Civilization wanted to go from one end to the other now, it would still take roughly thirty-four million years. Human lifespans were still not enough to let Human Civilization make a trip on the scale of the observable universe.
And yet that was only the observable universe. A diameter of 93 billion light-years was merely the limit of optical observation, caused by spacetime expansion exceeding the speed of light, so light from farther away could no longer reach human telescopes. In truth, the universe was even larger and broader.
For this reason, even after reaching Cosmic Civilization, the diameter of the universe observed by Human Civilization would still be 93 billion light-years. No matter how far Human Civilization continued to travel, that would not change.
Whether observing the universe from the Milky Way Galaxy or from the center of the Boötes Void, the diameter of the universe they saw was 93 billion light-years. Those 93 billion light-years were like a circle of vision. Move one's own position forward, and however many light-years one moved, the field of vision shifted forward by that many light-years as well, while