From the brightness of the markers in the system, he could clearly tell how well he currently understood these prerequisite technologies.
If he were to rate their brightness, the marker representing helium-3 fusion had already reached 90% of its normal brightness!
That also matched Lü Yongchang's current situation.
The biggest obstacle keeping helium-3 fusion from coming online was the fuel supply.
Once the helium-3 supply problem was solved, helium-3 fusion could enter practical use at any time.
Aside from helium-3 fusion, biosphere technology ranked second in brightness.
Its marker was at roughly 50% brightness.
That was normal, too.
After all, the Biosphere 2 Project was not an idea Lü Yongchang had been the first to propose.
It had originally been a miniature artificial ecological recycling system built by the United States.
As for Biosphere One, that naturally referred to Earth, on which humanity depended for survival.
The project's original aim had been to demonstrate the feasibility of a closed ecosystem supporting and sustaining human life in outer space.
Simply put, it was a test of whether humans could recreate a stable, closed ecosystem beyond Earth.
This technology held enormous significance for interstellar exploration.
Whether for a Starship making interstellar voyages or for colonizing other planets, artificial biosphere technology was an essential prerequisite.
The United States' Biosphere 2 Project covered 13,000 square meters and stood roughly eight stories tall, its main structure a sealed, steel-framed glass building.
To fully simulate Earth's environment, Biosphere 2 reproduced most of the environments found on Earth, including deserts, marshes, thorn scrub, rainforests, savannas, and even an ocean.
In addition, to simulate Earth's ecology more realistically, approximately 4,000 species were introduced into the enclosure, including around 3,000 animal and plant species and 1,000 microbial species.
To ensure Biosphere 2 was completely isolated from the outside world,