Titan.
The Solar System's second-largest moon, it possessed an atmosphere 1.5 times thicker than Earth's.
It actually had wind, rain, and seasons.
Yet its sky was a murky yellow, as though filled with blowing sand.
Through its haze-like atmosphere, and because of the immense distance, the Sun was not much larger than an ordinary star—only brighter than the other visible stars.
But directly overhead to the north, enormous Saturn resembled a monster that had invaded the real world. It glowed faintly red, carrying an overwhelming sense of intrusion.
As for Earth, their homeland 1.5 billion kilometers away, it had long since vanished from sight.
The view was indescribably magnificent, indescribably strange, and deeply moving.
Boundless's Solar System progress was steadily rising: 73%.
Liu Di was in high spirits.
He decided to make up for all the companionship he had missed, accompanying the little boy in an extracurricular experiment like countless other parents.
A circular particle collider with a total length of 23,000 meters was being constructed.
Like a precise, intricate pipeline, it stretched from north to south, lying across Titan's vast surface.
On Earth, the Large Hadron Collider at the European Organization for Nuclear Research ranked first in the world, yet it was only 13.6 kilometers long.
Nanobots and Steel Di Qi worked with astonishing efficiency. In just four hours, the machine had reached 99% completion.
Little Liu rubbed his hands excitedly and paced back and forth in a spacesuit.
At last, construction reached 100%.
The instant the little boy pressed the charging button and lit up the collider, he felt like the happiest handsome guy in the world.
His eyes shone as he said, "The tunnel will be maintained at an ultra-low temperature of -271°C. At that temperature, superconductivity will occur, allowing the particles to travel through the pipes