Chapter 1604: Phobos, the moon coming to Mars

Chapter 1792: Phobos, the moon coming to Mars
At this time, Feifei looked at Zhao Zhongyao and said, ‘Dad, I’m ready to land on Mars. This time I must take a good trip on Mars. Mars is one of the planets I most want to go to. ’
‘Okay, let’s start flying to Mars! After Zhao Zhongyao finished speaking, he drove the spacecraft to Mars again.
Only when flying hundreds of thousands of kilometers away from Mars, Feifei thought of Mars and two small natural satellites. He thought, since he wants to travel and explore on Mars, he might as well visit the two small moons of Mars first. After all, these two small satellites are not well understood by ordinary people.
For Feifei, although he has some knowledge about Mars, he doesn't quite understand what the two small moons of Mars look like. He wants to know the knowledge of these two small satellites.
Thinking of this, Feifei looked at Zhao Zhongyao and said, ‘Dad, or else, let’s take a look on the two small satellites of Mars first! Are these two small satellites also very special? We might as well travel on these two small satellites first. ’
After hearing Feifei’s words, Zhao Zhongyao smiled and said, ‘Okay, let’s travel on the two small satellites of Mars first. ’
After hearing what my dad said, Feifei said again, ‘dad, then we are going to travel on which satellite first! ’
Feifei knows that Mars has two moons, Phobos and Phobos. These two moons are very special, very small planets in the solar system.
After hearing Feifei’s words, Zhao Zhongyao said, ‘Of course I’m going to travel on Phobos first. Because this is a very special small satellite. ’
‘Okay, let’s go to Phobos first! After hearing what Dad said, Feifei also agreed with Dad.
So, Zhao Zhongyao flew to Phobos in his spacecraft. The spacecraft is fast. After just a while, they flew near Phobos.
The spacecraft is now dozens of kilometers away from Phobos. From this place, the entire Phobos situation can already be seen clearly.
‘Dad, this is really a very special little satellite! Then your father, do you know this small satellite well? Can you tell me more about this small satellite? Feifei said, looking at his father again.
‘I also have a better understanding of this small satellite, so let me talk about some more knowledge about this small satellite! ’
Next, Zhao Zhongyao said something about this small satellite.
Phobos is a small celestial body with an irregular shape. Phobos is one of the darkest bodies in the solar system. It moves around Mars 3 times a day, and the average distance from Mars is about 9378 kilometers.
Phobos is in the shape of a potato, orbiting Mars 3 times a day, with an average distance of about 9378 kilometers from Mars. It is the larger of the two moons of Mars and the one closer to Mars. The distance between Phobos and Mars is also the shortest distance between all the moons in the solar system and their host star, only 6000 kilometers from the surface of Mars. It is also one of the smallest moons in the solar system,
Phobos is a small celestial body with an irregular shape. Moving around Mars, the orbit is about 9400km from the center of Mars, which is 6000km from the surface of Mars. Phobos is closer to its parent star than the moons of other known planets. Phobos is one of the lowest reflective objects in the solar system. Phobos has a huge impact crater called Stickney. Since the orbit is very close to Mars, Phobos rotates faster than Mars' rotation. Therefore, from the surface of Mars, Phobos rises from the west, moves across the sky and falls in the east in 4 hours and 15 minutes or less. Due to the short orbital period and the action of tidal forces, Phobos' orbital radius is gradually getting smaller, and eventually it will hit the surface of Mars or break into a Martian ring.
Phobos is an irregularly shaped celestial body, roughly 27 kilometers long, 22 kilometers wide, and 18 kilometers high. It orbits Mars every 0.319 days at a distance of 9,235.6~9,518.8 kilometers away from Mars. This is faster than the rotation rate of Mars. Therefore, if humans reach Mars, they can also see the Martian
moon
rising from the west to the east. Most of Deimos I and Deimos are considered captured asteroids, and some people believe that they originated outside the solar system, rather than from the asteroid belt.
From November to December 1971, the US Mariner 9 Mars probe took the first pictures of Phobos and Deimos. The outline size of Phobos is 26.6 kilometers × 22.2 kilometers × 18.6 kilometers, and the shape is a bit like a potato. It moves around an average distance of about 6000 kilometers from Mars, and it takes 7 hours and 39 minutes to make a full revolution. Due to its small size and weight, Phobos' gravitational pull is relatively weak, only equivalent to 11,600 of the Earth. In addition, Phobos’ orbit is slowly decaying (decreasing by 9 meters every 100 years) and will crash into Mars in another 40 million years.
Phobos has always been the research object of scientists' attention. Understanding Phobos can give us a lot of information about the early history of the solar system. Alexander Zakkharov, the chief scientist of Russia’s Phobos-Soil program, said:
It may provide us with clues about the formation of satellites of the Earth and other planets, and understand the impact of asteroid impacts on rocky terrestrial planets. "Phobos' longest axis always points to Mars, and one side always faces Mars, making it an ideal place to observe most of the surface of Mars.
At the end of the last century, the former Soviet Union and Russia had successively formulated and implemented two plans to use autonomous detectors to study Phobos, but unfortunately they were unsuccessful due to failures of the detectors and launch vehicles. The first plan began in the late 1970s. Out of technical and financial considerations, two spacecraft were planned to be built, one hovering at an altitude of 50 meters above Phobos to conduct television cameras and scientific experiments; the other Perform Phobos sample return mission. The launch time of the two detectors was 1988, so they are called the "Phobos-88" project. In addition to Phobos, the mission's research objectives also include Mars, the sun, and space.
Looking at Feifei, Zhao Zhongyao talked about Phobos. After Feifei listened to it, he was also a little curious about this small satellite.
‘Dad, can our spacecraft land on this small satellite? I want to look on this small satellite. Feifei looked at Zhao Zhongyao and said.
After hearing Feifei’s words, Zhao Zhongyao said, ‘Okay, how difficult is this? Our spacecraft can land on which planet wants to land. As long as it is a planet in the solar system, or a satellite, we can land. ’
‘Okay, let’s go to this small satellite first. I heard that there is abundant groundwater on this small satellite! Can we explore it above? Feifei looked at Zhao Zhongyao and said.
‘Yes, I also heard that there is abundant groundwater on this small satellite, so we might as well go to this small satellite first. ’
After Zhao Zhongyao finished speaking, he drove the spacecraft to the small satellite again. This is a small satellite a bit like a big potato. Just at one end of this small satellite, there is a huge impact crater. It may be hundreds of millions of years ago when that asteroid flew over this place and collided with this small satellite.
Zhao Zhongyao now flew the spacecraft to this mysterious little satellite-Phobos. Their spacecraft soon flew over this small satellite.
Zhao Zhongyao directly piloted the spacecraft and flew to the end of this small satellite. That is, the sky above the impact crater.
Zhao Zhongyao decided to land the spacecraft into this impact crater. Then, he and Feifei can get out of the spacecraft and go on an expedition to the surface of this small satellite.
Feifei also wants to explore the surface of this small satellite. He saw Dad drive the spaceship over this impact crater. Just looking at Dad and said, ‘Dad, let’s land under this crater! ’
‘Well, we are going to land at the bottom of this crater. This is a very strange impact crater, let's go inside and study it. ’
After Zhao Zhongyao finished speaking, he drove the spacecraft slowly to the bottom of the impact crater. Soon, their spacecraft landed to the bottom of this huge impact crater.
This impact crater is not particularly large when viewed in the air. But when they landed the spacecraft to the bottom of this impact crater, they felt that it was a very huge impact crater.
This impact crater is Stickney Crater. There is also a smaller crater inside Stenik crater, about 2 kilometers (1.2 miles) in diameter, which was caused by the subsequent impact. Grooves and chain pits seem to radiate from Stickney.
These impacts that led to the formation of Stickney Crater almost destroyed Phobos theory. However, evidence from the Mars Express orbiter shows that these are related to Stickney Crater and may be affected by material ejected from Mars.
It is worth noting that some material on the inside of this crater fell into the crater to form soil and rock dumping, resulting in obvious linear texture. Stickney Crater may be the size of a land that can be seen from the surface of Mars with the naked eye. It is located in the center of the western edge of Phobos' front facing Mars.
Zhao Zhongyao parked the spacecraft at the bottom of this huge impact crater. Then, he took Feifei out of the spaceship. Of course, the two of them got out of the space after wearing spacesuits. This is a very strange cold world. They must wear spacesuits to come outside the spacecraft.
Everyday, I was arguing about coming out of the spacecraft! But Zhao Zhongyao told her. There is nothing good about Phobos. He and Feifei will come back after just staying outside. Their purpose is Mars, not this small moon.
Hearing what my father said every day, I didn't make a noise about going out.
Zhao Zhongyao and Feifei came out of the spaceship together, and then they stepped onto the hard rocky surface of Phobos.
Because Phobos is very small in size and mass. The gravity on it is also very small. Probably only one thousandth of the earth.
When Zhao Zhongyao and Feifei came out of the spaceship. Zhao Zhongyao looked at Feifei and said, ‘When we walk on this small satellite, we must be careful. The gravity of this small satellite is very small. We can't jump up. If we jump up hard, we might fly into space. Of course, it is very likely that they will ‘fall’ directly onto Mars. ’
Because this small satellite is very close to its parent star, Mars. Phobos may be only more than 6,000 kilometers from the surface of Mars. This is a very close distance. You know, our earth is 300,000 kilometers away from the moon.
After hearing what my father said, Feifei quickly took his father's hand and said, ‘It’s so scary! Then we must hold hands. Otherwise, we will both fly into space. ’
Zhao Zhongyao and Feifei walked forward together holding hands. After walking some distance, they saw another huge crater in front of them.
Feifei looked at the reappearing crater and looked at Zhao Zhongyao and said, "Dad, it’s not surprising to you that there is still a giant crater in this giant crater. This is really true. It's amazing! ’
After hearing Feifei’s words, Zhao Zhongyao smiled and said, ‘haha, what’s so magical about this. This smaller crater was formed after this large crater was formed and then impacted in this large crater. ’
‘Dad, can we take a look in this smaller crater! I heard that there are still a lot of water resources on this Phobos! Feifei said, looking at his father again.
Zhao Zhongyao heard Feifei’s words and said, ‘Yes, according to the data, there are a lot of fresh water resources under the surface of this small Martian satellite. This is a very rare thing. ’
‘Then can we go and see in this smaller crater. Let's see if there is water in it. Feifei said, looking at his father again.
‘Okay, now that we have come to this place, let’s see if there is water in this smaller crater. Said Zhao Zhongyao.
‘Dad, how can we get into this smaller crater! Should we take the spacecraft to this smaller crater again? Feifei said, looking at his father again.
Zhao Zhongyao now stands on the edge of this huge crater and said, ‘Actually, we can also come to the bottom of this crater in a more interesting way. ’
After hearing what Dad said, Feifei said in a puzzled manner, ‘Dad, what should we do then! We didn't take a small planetary car or other means of transportation. How can we get to the bottom of this crater quickly? ’
At this moment, Zhao Zhongyao looked at the bottom of the crater in the distance and said, ‘I see, we can fly over. ’