Thus, as the story continued, it became named as Bi Su.

Of course.

There's also a more intuitive illustration—have you seen Jupiter's fork?

Yes, that's the thing.

In modern astronomy, Bi Su is located in Taurus, adjacent to Pleiades.

Aldebaran among them has a diameter of about 53 million kilometers, which is 38 times that of the Sun, and is extremely bright.

On October 19, 2005, the sky presented an astronomical spectacle where the stars of Bi Su vied for brightness with the moon.

Back then, in many small places, you could still find quite a few 'conmen' setting up telescopes on the streets, luring children to look at the stars, charging ten yuan per view.

Now, those who drive an SUV dragging telescopes worth thousands in the amateur astronomical circles achieved their initial capital accumulation through such means.

The perspective returns to its original place.

Old Su, being the person most familiar with star maps at the time, quickly locked onto the region where Bi Su was located, following Xu Yun's guidance.

Xu Yunjian continued:

"Sir, if my memory serves me right, that supernova is to the northeast of Bi Su..."

Upon hearing this, Old Su quickly locked his gaze on the star-finding mirror, adjusting the screws and continuing to calibrate.

Seeing Old Su becoming more adept at the operations, Xu Yun wanted to tell his classmates from the previous life, 'Look at Old Su.'

Of course.

By then, those cheeky readers would probably screenshot the power ranking chart from a starting point, tag me back as a counterattack—"Look at the Eagle!".

Damn tentacle monsters.jpg.

And so.

After a while.

Old Su suddenly showed a startled expression, beckoning Xu Yun with his left hand:

"Xiaowang, come take a look, is this star... or rather this object, the Crab Nebula?"

Xu Yun quickly leaned forward.

At this moment.

In the field of view of the star-finding mirror in front of Old Su, a small, high-brightness white light cluster could be faintly seen.

Xu Yun was all too familiar with the shape of this light cluster, nodding immediately:

"Indeed, this is the Crab Nebula."

Old Su was delighted upon hearing this, immediately energized, quickly following the operations Xu Yun had taught him to perform the final focus.

After a quarter of an hour.

Old Su suddenly let out a light surprise, saying:

"Huh? Xiaowang, isn't this incorrect?"

Xu Yun winked at him:

"Sir, what's incorrect?"

Old Su glanced at him, pointing at the image in the eyepiece, said:

"Why is there no star in this light cluster, as if it's just a glowing gas cloud?"

Actually, friends who understand the Crab Nebula should all know.

At the core of the Crab Nebula, there is a pulsar with a diameter of 20 kilometers.

However, due to limitations in equipment precision, Old Su obviously couldn't see the innermost conditions—even the Hubble Telescope would need an exposure of more than 24 hours.

Thus, Old Su could only judge based on the intensity of the luminous body, thereby concluding that there are no planets within the entire nebula.

Xu Yun paused for a moment without directly explaining, instead saying to Old Su:

"Sir, have you ever seen fireworks?"

Old Su stroked his beard, nodded:

"Indeed."

Fireworks appeared during the Sui and Tang Dynasties, became popular in the Song Dynasty, and are now relatively common.

For example, "Heaven-Shattering Thunder" Ling Zhen in Water Margin.

Besides overseeing the production of firearms, he was also responsible for making fireworks, which were set off during festivals in Bianjing.

Xu Yun paused briefly, then asked:

"May I ask, sir, what is the usual scene after the fireworks soar into the sky?"

Old Su pondered for a moment, then clamped his left hand fingers together, mimicking an explosive gesture:

"First, they rise to a certain height, suddenly explode, momentarily shining as bright as daylight, and then turn into ash... wait!"

As Old Su spoke, he suddenly realized something.

He lifted his head abruptly, his gaze fixed on Xu Yun:

"Xiaowang, are you saying... that the white light we saw fifty years ago, or the whole of Bianjing saw, was precisely the scene of that guest star's explosion?"

Xu Yun nodded heavily in affirmation:

"Indeed."

Old Su's pupils suddenly shrank.

The star....

Exploded?

What we can see now is just the lingering afterglow?

Old Su's chest heaved a few times, then he took a deep breath, asking:

"Xiaowang, how does that star compare to Earth?"

Xu Yun thought for a bit, then answered:

"In terms of mass... over three million times, at least."

It's well known.

Due to its insufficient mass, the Sun cannot become a black hole or a neutron star.

In the final stage of a star, it can only first become a red giant, then turn into a white dwarf.

Only stars with more than eight times the solar mass will first expand into a red supergiant, and then explode in a supernova.

Eventually turning into a black hole or a neutron star.

Of course.

There are also cases where a white dwarf eventually turns into a neutron star, though these are relatively rare.

To supplement understanding of how terrifying a neutron star is, here's a more intuitive number than density:

The diameter of a neutron star is generally about ten kilometers, but its spin rate can reach hundreds of revolutions per second.

Yes.

Per second, not per minute.

That is, within the blink of an eye.

The fastest spinning neutron star discovered so far is named PSRJ1748-2446ad.

Despite it looking like a code, it's actually terrifying:

With a diameter of 20 kilometers, its rotation speed reaches as high as 716 revolutions per second.

You can visualize the scene to your liking, it doesn't need further elaboration.

In other words.

The progenitor star of the Crab Nebula was massive enough to undergo a supernova explosion, indicating its mass was at least eight times that of the Sun.

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