Many people were thinking this.
Zhao Yi had actually given an 'abridged' explanation; outwardly, the reason certainly is to form a cross-section that blocks gravitational waves, but in fact, the most basic principle of antigravity is to create a space barrier within a certain range, which is the interaction between photons and space, forming an area that 'reduces the squeeze of space on mass points'.
Since the principle of antigravity is related to the interaction with space, it is naturally independent of mass. The antigravity effect can be produced, but it is more noticeable due to Earth's large mass and close proximity.
That was all.
Zhao Yi couldn't possibly disclose more in-depth content; he was merely there to give a basic report and explain some of the mathematical theories behind antigravity.
...
On the day of the report.
The Mathematical Center was already packed early on, with each person who came being a renowned name in the world.