That was not a normal reduction in mass caused by black hole evaporation. The black hole before humanity had a mass of 107 billion solar masses, making it a Medium-Mass Black Hole. The larger a black hole's mass, the slower its evaporation rate. It could not possibly show a change in mass over such a short period.
Of course, the mass reduction caused by humanity was also minuscule. With humanity's Negative Energy extraction capabilities, even extracting for hundreds of millions of years would not drain the black hole's mass.
Yes, mass!
Humanity was clearly extracting Negative Energy, and the Negative Matter formed through compressing Negative Energy even had negative mass. Yet the black hole as a whole displayed a reduction in mass.
By normal reasoning, its mass should have increased instead.
This immediately made human scientists realize that black holes possessed even more mysterious unknown phenomena. There had to be some intrinsic connection between Negative Energy and the way mass behaved.
It should have been some kind of mass-bestowing Higgs Mechanism.
Human scientists discovered that Negative Matter compressed from Negative Energy displayed negative mass, yet it still occupied spaceship payload capacity.
Logically, if a spaceship carried ten jin of positive-mass cargo and another ten jin of negative-mass cargo, its cargo mass should have been zero. But reality defied intuition.
Here, positive and negative mass did not cancel each other out to zero. Instead, their effects stacked.
Whether under conventional acceleration or Warp, their masses were added together, as though the universe had placed an absolute value around negative mass before doing the math.
This involved the secrets of mass and the mechanisms of the Higgs Field, matters humanity did not yet understand in detail.
Humanity also did not know whether Level 6 Civilizations had mastered this. Probably not. Otherwise, if