So the relative positions of the intrinsic reference points remain unchanged.

Assuming an intrinsic reference point spontaneously generates a static object from nothing, analyzing its force and motion conditions, keeping it always stationary.

Then the force it experiences and the acceleration correspond to a balanced cancellation.

As for the second example mentioned by Xu Yun, it's actually an astronomical concept known as the "drag effect," which belongs to the frontier theory of spacetime curvature.

Indeed, in later generations.

It was a super-long experiment lasting 48 years that delivered the final blow to Little Niu's bucket theory.

This experiment was called Gravity Probe B.

Its core purpose was to precisely measure the geodetic drift and inertial frame dragging near the Earth to quantitatively test the General Theory of Relativity.

Its main device was a highly precise gyroscope placed on a satellite, with the satellite's orbit being circular and passing through the Earth's north and south poles.

At an altitude of 642 kilometers, it measured the rotation of the gyroscope axis relative to the background of the starry sky.

According to the General Theory of Relativity calculations.

The geodetic drift and inertial frame dragging on this satellite gyroscope axis were calculated to be 1.8 milli-arcseconds per year and 0.1 milli-arcseconds per year, respectively.

Gravity Probe B was hosted by Professor Everitt from Stanford University, starting in 1963 and ending in 2011.

The first 45 years were supported by NASA, and it was also NASA's longest-supported project, costing a total of 750 million US Dollars.

In the last three years, funds were raised by a Saudi prince with a PhD degree from Stanford University, costing over 30 million US Dollars.

What?

You ask why 750 million was spent in the early 45 years, but only 30 million in the recent three years?

Don't ask, the answer is inflation.

Of course.

Although there was a lot of profit in this project, the actual funds invested were still a very large amount.

However, despite the enormous time and financial expenditure of Gravity Probe B, the results were not ideal.

According to the initial declared goals.

Gravity Probe B was supposed to provide geodetic drift data with a precision of 0.01% and inertial frame dragging data with a precision of 1%.

Yet the final results had accuracies of only 0.28% and 19%, more than 20 times below the expected precision.

On the other hand.

Although the precision variances were large, it still successfully used the gyroscope to straightforwardly falsify the conclusion that "once a gyroscope's axis points in a certain direction in the background starry sky without any external interference, it always maintains that direction."

Thus thoroughly denying Little Niu's concept of absolute spacetime in reality—combined with theoretical arguments, this was considered a conclusive closing argument.

Incidentally.

In the early 1980s, Everitt once came to Huaxia, hoping to recruit a well-known Huaxia gyroscope expert from the Seventh Machine Department.

But this request was ultimately rejected by us, due to concerns about those experts not being able to return.

The expert Everitt had his eyes on was named Gao Bolong, a pioneer who had made stunning achievements in Huaxia's fighter aircraft industry, a true merit.

Three years before Elder Gao passed away, he was interviewed by Southern Weekend.

During the interview, he said something quite poignant:

"They (across the sea) offered fifty times the annual salary, settled in US Dollars, and at that time we were so short of foreign exchange it was almost like selling blood, the foreign exchange reserves in 1980 were negative 1.3 billion—yeah, negative."

"So I discussed with the minister, I said, Minister, if I go across the sea, I'm not likely to come back in this lifetime, trading me for such a large sum of foreign exchange seems quite worthwhile, I have this awareness, maybe headquarters should consider this?"

"The minister scolded me harshly on the spot, saying don't even think about it, talents like you can greatly help the country in the future, letting you go for some foreign exchange would be a crime!"

"So I stayed in the country, not failing the country's expectations, and I could give an explanation when I saw the minister."

How lamentable, how admirable.

Back to the topic.

Actually, according to the normal trajectory.

Little Niu adhered to his absolute spacetime concept until his death; theoretically, such doubts should not have arisen.

So clearly.

Little Niu's firm concept must have been shattered by certain circumstances, causing him some unresolvable unease.

Upon thinking about it.

Xu Yun couldn't help but focus his gaze on the end of Little Niu's letter, lingering on the sentence about the dispersion phenomenon for a few moments.

As is well known.

The interaction between matter is achieved through fields, so it is simply referred to as field action.

The field velocity is the speed at which the field propagates, and it is generally believed that the speed of light is the same as the field velocity, with light being the electromagnetic field in propagation. 𝒻𝘳𝘦𝘦𝘸ℯ𝒷𝘯𝘰𝑣ℯ𝑙.𝘤𝑜𝘮

In other words.

In Little Niu's concept of absolute space-time, the properties of light are particles.

And judging from the end of Little Niu's letter...

He seemed to have observed some anomalies in the properties of light through the study of dispersion phenomena?

"This should be the most likely scenario...."

In the space.

Xu Yun, while touching his chin, slightly furrowed his brows:

"It's just that Little Niu didn't mention in the letter the anomalies he discovered in the dispersion phenomenon. If he had conducted the double-slit interference experiment, let's not mention the difficulty of performing this experiment in the 17th century, but his tone could definitely not be that hesitant....."

Upon this thought.

Xu Yun hesitated for a moment, contemplating certain matters in his mind.

Finally, he picked up a pen and paper, writing down the last sentence in the letter:

"Mr. Newton, although I'm not sure of your doubts, have you ever considered...."

"The properties of light..."

"Could possibly coexist in two situations?"

.......

"In other words, the absolute space you refer to, without other cosmic matter, is actually a bucket reference frame." "Then we assume again, still in our universe, but our bucket's mass is rooted... a little smaller, approximately the size of the Earth.

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