Old Su was taken aback by the words and turned to Xiaoli beside him, beckoning:

"Qingzhao, hold this ball for me."

After simply handing the ball over to Xiaoli, Old Su quickly rushed to the wall and began to carefully examine the light spot.

At this moment.

The light spot had already disappeared from the place marked by the chalk and moved to.....

Another side, approximately one foot long!

Old Su's heart suddenly skipped a beat.

Before the experiment began, he had personally checked those four iron balls.

He could guarantee that there was no magnetic attraction between the iron balls, and there wasn't the slightest bit of wind in the room.

Also during the experiment, Xu Yun and he did not touch the torsion balance.

Therefore, theoretically speaking.

The entire torsion balance combination should always be in a balanced static state, it should not deform due to the proximity of the iron balls.

That is to say...

After being amplified by some technical means, they indeed witnessed the existence between objects of...

Gravity!

The impact of this concept on Old Su was far greater than the explanation of gravity—after all, Old Su... or rather many sages had long been curious about why objects fall and had made hypotheses.

Although the guesses differed somewhat from gravitational theories, the nature of such force is still similar.

It's just that in the deepest part of Earth, there is no kind of real special soil attracting objects using magnetic force.

Thus, while the definition of gravity somewhat conflicted with Old Su's understanding, it wasn't to the extent of a worldview collapse.

However, the experiment at hand proves that between any two objects on the ground—be it between people, objects, or people and objects, there's a faint but tangible attractive force!

This is a notion that no one has ever mentioned from ancient times to present!

The concept of gravity is almost like in later times, you finally meet your online lover on Valentine's Day and plan to flaunt your relationship in your social circle.

Then you find out upon meeting that the other party is a fake, with looks drastically different from their photos, proportions completely off, with three measurements all being 120, height 160, and weight 160.

Such mental shock, although significant, is not enough to drive you insane.

But the concept of gravity is different.

It's not within the range of a fake. It's like finding your wife is a 6-meter tall skeleton after meeting in person!

Such a level of mental shock could likely lead to most people having a collapse of worldview or even being frightened to death alive.

But on the other hand.

This is also a clear fact before everyone's eyes. Even if you were really scared to death, it couldn't change its existing nature.

Thinking of this.

Old Su couldn't help but raise his head and look towards the light source outside the house.

At this moment.

This tiny light source was like a portal, slightly unveiling a corner of the world's truth...

It was a field he had never thought of or touched in the past decades...

Then he forced himself to calm down, paid no attention to the equally shocked Xiaoli and Xiaozhao, and turned to Xu Yun asking:

"Xiaowang, if my memory serves me right, you mentioned before...

The earth beneath our feet and the stars of the world are all round?"

Xu Yun nodded and answered:

"That's right."

Upon hearing these words, a light immediately flashed in Old Su's eyes.

His tone even carried a hint of anticipation:

"Since gravity can be reliably proven by physical objects, then Xiaowang, do you have concrete evidence for the claim that stars are round?"

Xu Yun was silent for a moment and still nodded:

"Yes."

........

Note:

It's been a long time since I've written such a serious science popularization chapter. Actually, it was quite tiring to write, after all, I have to be responsible for what I say, and can't fabricate things or make false claims....

I've written a few science popularization chapters in the previous book, and the response has been quite good, new readers can rest assured that these large-scale popular science chapters will not appear often, probably only once every hundreds of thousands of words.

This is a super long chapter, please give me some monthly votes....

If you find any errors ( broken links, non-standard content, etc.. ), Please let us know < report chapter > so we can fix it as soon as possible.