(Hmm...... Push a book for a coffee bean...... It's called "The Apartment Life of the Authors...... Actually, I didn't really want to push, but I had to...... So...... I declare in advance that the slim character of Matsudaira inside does not represent my character!! ）

…………

"What kind of astronomical phenomena is such a large telescope observing? Sister Sonoko never told me what she was going to see, she just said it was an astronomical wonder," Mitsuhiko said curiously. "Do you want to use this to observe meteor showers?"

"Sameklevi, right?" Chiba tentatively suggested this answer. "Anyway, if it's an astronomical wonder, this is definitely the one that attracts the most attention during this time period."

"That's right," Jiroji Suzuki smiled and nodded. "That's it—that's why I'm going to build such an astronomical telescope set up on an airship, and you and I will be the luckiest people on Earth to be the first to observe this space necklace!"

"Space necklace?" Yuan Tai said curiously. "What's that, necklace?"

"Shoemaker Levi? Space necklace? Mitsuhiko seemed to remember something. Wait a minute, isn't it a string of meteorites that look like a necklace? I think I've seen it in an album before! ”

"Shoemaker-Levy 9," just then, a middle-aged man in a suit and leather shoes suddenly appeared on the other side of the telescope, speaking in a rather cheerful voice. "As you said, the Sumeklevy 9 is known as the Space Necklace because it has broken into a long string of pieces."

The middle-aged man walked up to everyone and introduced himself to everyone after saying the previous sentence. "Okita, a member of the Celestial Search Department of the Tokyo Observatory, is cooperating with the Suzuki Foundation to conduct observations on Sumeklevi."

"He's amazing," Jiroyoshi Suzuki said as he introduced himself. "His teacher was Mr. Koichiro Tomita, who could almost be said to be one of the pioneers of professional astronomical observation in Japan."

"Why did it shatter into a long string of pieces?" Motota asked again. "Could it be that this Sumeklevi has been struck by something before, so that's why it shattered?"

"This question ......" Okita gave a subtle expression, then looked in the direction of the telescope. Honda, tell them about it after the maintenance. ”

"Okay!" From the telescope came the voice of a young man who was much younger than Okita.

"Then I, I'll have to go first," Okita said, turning his head back to the children. "The Honda over there will explain these things to you, and I need to go back and sort out the data that I might need for observations."

……

Honda is a young man who looks to be in his twenties, so he is much more lively than Okita, and his interaction with Chiba is also much more positive.

"Shoemaker Levi was discovered on March 24, 1993, when a man named Shoemaker and a man named Levy found them at the same time, and on March 27, they announced the exciting news."

"Interestingly, on that photo, they found that there seemed to be something unusual about the comet – this comet pulled out a very long afterimage." Honda compared it with his hand and continued. "Eventually, they found out that it was supposed to be a necklace-like string of pieces from a comet."

"But why did this comet shatter?" Mitsuhiko asked. "Did you get hit by something?"

"In addition to being hit, there are other forces that can shatter this comet," Honda shook his head with a smile. "Through the scientists' reconstruction of the comet's orbit, they believe that the comet has been orbiting Jupiter, and it is likely to be very close to Jupiter on July 7, 1992, probably only about 40,000 kilometers - you must know that Jupiter is a big thing with a radius of 70,000 kilometers, for which 40,000 kilometers is equivalent to passing by."

"Forty thousand kilometers...... Yuan Tai was a little dazed. It seems like it's still quite far away......"

"It's close enough," Qian Yu glanced at Motota. "For Jupiter and comets to pass by, less than 50,000 kilometers is close enough."

Honda looked at Chiba with a somewhat surprised look, and a smile appeared on the corner of his mouth.

"Why?" Yuan Tai was confused.

"Roshi Limit," Thousand Feathers replied. "To put it simply, if a small planet, such as Sumyklevi, passes near a large planet, such as Jupiter, and if Sumeklevy enters Jupiter's Loch limit, then Jupiter will have a strong enough attraction to Sumyklevy that the whole of Sumyklevy will be torn apart."

"Why was it torn apart?" Motota probably understood what the Roshi Limit was, but he still didn't understand the true meaning of it.

"You know gravity, right?" Qian Yu sighed and began to explain from a more basic aspect. "There is a very weak gravitational pull between even two small objects – even if it's just two plates."

"Now excuse me, if I stack two plates on top of each other and pick up the plate on top, will the plate below be pulled up by the gravitational pull generated by the plate above?"

"No," Yuan Tai said without thinking. "Because the gravitational pull is too small."

"That's right," Chiba nodded. "The Earth is very close to these two plates, so the gravitational pull is strong enough to suppress the gravitational pull between the two plates. But what if these two plates are not on the ground, but in space? In space, the gravitational pull of the Earth is almost zero. ”

"That is, if you are in space, if you pull one of the plates in a certain direction, the other plate will be attracted to it?" Yuan Tai frowned, as if he understood something.

"That's true in theory, but it's unlikely in practice, because the plate is so light that it barely generates gravity," Qian Yu replied with a smile. "But that's pretty much the same – Shoemaker Levi is the two plates, and Earth is the equivalent of Jupiter. And the reason why Smy Klevy was torn apart was because within the distance of the Loch limit, the gravitational force that he produced that could be used to attract all his matter together was less than that of Jupiter, so Smy Klevy was torn into many pieces. ”

"And what's the Roch limit?" Mitsuhiko asked. "What do you mean when you say that within 50,000 kilometers is close enough?"

"There is a formula for the limit of Luoxi, but I don't feel like you can understand the formula when I tell you......" Qian Yu showed a somewhat tangled expression. Something like this, the greater the density of the large planet and the smaller the density of the small planet, the greater the range of this Loch limit. If we bring in the data of Jupiter and Shoemakerklevy, this distance from the center of Jupiter is about 1.75 to 3.4 times the radius of Jupiter, which means that in any case, the Loch limit will not be less than 1.75 times the center of Jupiter, that is, 122,500 kilometers. ”

"In other words, Jupiter's Loch limit distance to Sumeklevy will not be less than 52,500 kilometers, and Sumeklevy has already entered this range on July 7, 1992, and it is inevitable that it will be torn."