(Hmm... Help a certain coffee bean promote a book... The name is "Authors' Apartment Life"... Actually I don't really want to push it, but I have to... So... I declare in advance that the Matsudaira Slim in it

('s character does not represent my character!!!)

…………

"What kind of astronomical phenomenon is such a big telescope intended to be observed? Sister Sonoko never told me what it was intended to observe before. She only said it was an astronomical wonder." Mitsuhiko asked curiously. "Are you going to use this to observe meteor showers?"

"Sumeike Levi?" Qianyu tentatively proposed this answer. "Anyway, if it is an astronomical wonder, this is definitely the one that attracts the most attention during this period."

"That's right," Suzuki Jiroyoshi smiled and nodded. "That's it - that's why I want to build such an astronomical telescope on an airship, and you and I will also be the luckiest people on earth to be able to observe this for the first time.

The man who strings space necklaces!”

"Space necklace?" Yuantai asked curiously. "What is that, a necklace?"

"Sumeik Levi? Space necklace?" Mitsuhiko seemed to remember something. "Wait a minute, is it a string of meteorites like a necklace? I think I have seen it in a picture album before!"

"Shoemaker-Levy 9," at this moment, a middle-aged man in a suit and leather suit suddenly appeared on the other side of the telescope, saying in a cheerful voice. "As you said, Shoemaker-Levy

9It was called the Space Necklace because it had broken into a long string of fragments.”

The middle-aged man walked up to everyone and introduced himself to everyone after saying the previous sentence. "My surname is Okita. I am a member of the Celestial Object Search Department of the Tokyo Observatory. This cooperation with the Suzuki Foundation is to investigate Shoemaker."

Dimensional observations.”

"He is very powerful," Suzuki Jiroyoshi took over and introduced himself. "His teacher is Mr. Tomita Koichiro, who can almost be said to be one of the pioneers of professional astronomical observation in Japan."

"Why did it break into a long series of fragments?" Yuantai asked again. "Did Shoemaker Levi be hit by something before, so it broke into pieces?"

"This question..." Okita showed a subtle expression, and then looked in the direction of the telescope. "Honda, please tell them about it after the maintenance is completed."

"Okay!" A voice that sounded like it belonged to a young man much younger than Okita came from the other side of the astronomical telescope.

"Then I, I have to go first," Okita turned his head back and said to the children. "Honda over there will explain these things to you. Now I need to go back and sort out the data that may be needed during the observation.

"

…

Honda is a young man who looks to be around 20 years old, so he is much more lively than Okita, and his interactions with Chiba and the others are also much more positive.

"Shoemaker Levi was discovered on March 24, 1993. At that time, a man named Shoemaker and a man named Levy discovered them at the same time. On March 27, they announced this exciting discovery

information."

"What's interesting is that in that photo, they found that the comet seemed to be a little different - the comet pulled out a very long afterimage." Honda gestured with his hand, and then continued. "In the end they

It was found that this should be a long necklace-like string composed of fragments from a comet."

"But why did this comet break into pieces?" Mitsuhiko asked. "Did it get hit by something?"

"In addition to being hit, there are other forces that can break the comet," Honda smiled and shook his head. "Through scientists' reconstruction of the comet's orbit, they believe that the comet has been moving

It orbits Jupiter, and 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 guy with a radius of 70,000 kilometers. For it, it is 40,000 kilometers.

One kilometer is like passing by."

"Forty thousand kilometers..." Yuantai was a little confused. "It seems to be quite far..."

"It's close enough," Qianyu glanced at Yuantai. "For Jupiter and comets to pass by, anything below 50,000 kilometers is close enough."

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

"Why?" Yuantai was confused.

"Roche limit," Qianyu replied. "To put it simply, if a small planet - such as Shoemaker-Levi, passes near a large planet - such as Jupiter, if Shoemaker-Levi enters

Jupiter's Roche limit range, then Jupiter will have a strong enough attraction for Shoemaker-Levi that the entire Shoemaker-Levi will be torn apart."

"Why was it torn open?" Yuantai probably understood what Roche's limit was, but he still didn't understand its true meaning.

"You know about universal gravitation, right?" Qianyu sighed and began to explain from a more basic aspect. "There is a very weak gravitational force between two objects no matter how small they are - even if it is just two plates."

"Now, if I stack two plates together and then pick up the upper plate, will the lower plate be pulled up by the gravitational force generated by the upper plate?"

"No," Yuantai said without thinking, "because the gravity is too small."

"Yes," Qianyu nodded. "The earth is very close to these two plates, so the gravitational force is strong enough to suppress the gravitational force between the two plates. But what if the two plates are not on the ground, but in space?

In space, the Earth's gravity is almost zero."

"In other words, if you are in space, if you pull one of the plates in a certain direction, the other plate will also be attracted towards it?" Yuantai frowned, seeming to understand something.

"This is true in theory, but in practice it is impossible because the plates are too light and can hardly produce gravity," Qianyu replied with a smile. "But it's more or less the same - Shoemaker Levi is these two plates.

, and the Earth is equivalent to Jupiter. The reason Shoemaker Levi was torn apart is because within the distance of the Roche limit, his own gravitational force that can be used to attract all his materials together is greater than that of Jupiter.

Those substances were less attractive, so Shoemaker Levi was torn into many pieces."

"Then what is the Roche limit?" Mitsuhiko asked. "What did you mean when you said that within 50,000 kilometers is close enough?"

"There is a formula for the Roche limit, but I feel like you don't understand it when I tell you the formula..." Qianyu showed a somewhat tangled expression. "It's probably like this. The greater the density of the big planet, the smaller the density of the small planet.

, the wider the range of the Roche limit. If the data of Jupiter and Shoemaker-Levi are taken into account, this distance calculated from the center of Jupiter is about 1.75 to 3.4 times the radius of Jupiter, that is to say

In any case, the Roche limit will not be less than 1.75 times from the center of Jupiter, which is 122,500 kilometers."
Chapter completed!