"Monoton, like the Moon, has a tidal locking effect." Lang Xiaonian emphasized this professional term.

"Tidal lock-in effect? What the hell? ”

This is a more in-depth knowledge in astronomy, and non-astronomy students will not see this term in textbooks.

Therefore, it is the first time Niu Dazhi has heard this term.

Lang Xiaonian likes to popularize science astronomy to his classmates, so he began to explain: "Let's take the moon as an example."

"The Moon is a sphere, and the distance from each point of the Moon to the Earth is different, so the gravitational pull of the Moon on the surface of the Moon is uneven.

"This uneven gravitational pull is the so-called tidal force, the tidal force caused by the Earth to the Moon.

To put it simply, the side of the moon facing the earth, which is close to the earth, naturally receives a greater gravitational pull, and the far side of the moon experiences a smaller gravitational pull.

"The difference between the two may not seem like much, but there is a difference. This difference, one day or two, or even a year or two, will not have a significant effect.

"However, over a period of hundreds of millions of years, this difference in gravitational attraction can have a big impact.

"The Moon itself is an irregular sphere that changes little by little under the action of uneven gravity, resulting in the deceleration of the Moon's rotation.

"Until the rotation of the Moon is slowed down to the point that one side is always facing the Earth, this change stops, so that one side of the Moon is always facing the Earth, which is tidal locking.

"Similarly, Beast One has the same tidal lock-on effect.

"Therefore, one side of the Beast Guard is always facing the Star Beast Planet, so the giant cannon built on the Beast Guard can lock on half of the Star Beast Planet forever."

Niu Dazhi didn't understand what he understood, but he felt very powerful.

He knew that Lang Xiaonian didn't dare to fool himself with this knowledge, and knew that he was thinking too much, so his expression was a little unhappy.

Lang Xiaonian didn't say enough, and continued to say with great interest: "In fact, it's not just the Moon and Zoomes, Jupiter is the same, Jupiter has a very large mass, there are several moons like the Moon, the rotation period and the orbital period are the same, and one side is always facing Jupiter.

"It's not just moons that are tidally locked by planets, scientists have also found that some planets are tidally locked based on other star systems."

When Niu Dazhi heard this, his eyes lit up, and he said: "If you say this, isn't there a planet that has one side that is always day and the other side is always night." ”

"That's right, the planets that are tidally locked by the stars are indeed eternal night on one side and eternal day on the other." Lang Xiaonian nodded in affirmation.

"Interesting." Niu Dazhi was ready to cover up the question he had just raised.

Eve wasn't so easy to fool, and snorted, "How's that?" You were talking to me just now, but now you know it's wrong. ”

Niu Dazhi made a straight face, snorted, turned his head and left: "I'm going to practice my new ability, I'm going to be a man destined to become an imperial fortress, so I don't have time to waste." ”

Eve winked at him, a triumphant expression, and was very happy.

……

Fang Yuan stood in front of the base of the giant cannon, pinching his chin, looking up at the empty mid-air, imagining that a hundred-meter giant cannon was about to be erected here, and there were faint waves in his heart.

Just imagine how terrifying this giant cannon is.

The length of the Shenzhou is not more than 100 meters, and the full load can reach 1,500 people.

Such a space battleship is only more than 100 meters.

Now, the barrel of a cannon is only 100 meters, and this kind of cannon is going to destroy the star, even if it can't bomb the planet, it is estimated that it is no problem to bomb a satellite.

"Eve, such a long barrel is an electromagnetic cannon, right?" Fang Yuan asked.

"According to the information I have found, it should be an electromagnetic kinetic energy cannon, but I don't know if the shell has a warhead." Eve replied.

Such a 100-meter-long electromagnetic cannon, and a space-based cannon, is simply a devastating threat to the planetary life below.

……

The next few days.

In addition to preparing for battle, the students of the military scientific research class will go to the beast guard to see the progress of the construction of this 100-meter giant cannon whenever they have time.

Finally, a month after occupying the beast guard, the 100-meter-long cannon barrel was erected.

When I saw this giant cannon appear in front of me, the exaggerated picture was far more spectacular than I imagined.

"I'll go! It's so big and so long, the barrel alone can stab the star beast to death. A student of the military scientific research class sighed.

"Are you sure it was stabbed to death, not stoned?" One of the others laughed.

After the barrel of the space-based cannon was erected, Eve's father Li Guihua came to Beast Guard, and brought a team from the Weapons Research Institute to take charge of the equipment of the space-based cannon.

As soon as Eve saw her father coming, she immediately asked about the data of the space-based cannon with sparkling eyes.

"How fierce is this cannon? When the time comes, can you let me play it again, it's longer than the Shenzhou with the base, it's too cute. Eve stood under the space-based cannon, so excited that she was short of breath.

The other members of the team were also very curious about this space-based cannon.

A group of people stood under the base of the casemate, looking up and drooling over the huge barrel of the cannon with their heads held high.

"I really want to shoot it." Ye Zheyu sighed.

"I want to fight all the time, and it's better not to stop." Niu Dazhi answered.

"You two go away! If you want to shoot a cannon, I will come first. Eve waved to chase the two guys away.

"Girls, what kind of guns, you better be a lady." Fang Yuan persuaded in a serious manner.

……

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