Seeing this, Jiahao shook his head helplessly, and said, "No, do you want me to introduce them one by one, you look there, look at the direction of my finger." ”

Orion, one of the constellations of the equatorial zone. Located between Gemini, Monoli, Canis Major, Taurus, Lepus, Pojiang and Canis Minor, its northern part is immersed in the Milky Way. The main body of the constellation is composed of 4 bright stars such as Betelgeuse and Betelgeuse to form a large quadrilateral. The best month to observe is January. The Herschel Space Observatory has discovered the chemical fingerprint of potentially living organisms in the Orion Nebula.

Orion, the most magnificent constellation of the whole day, is one of the constellations of the equatorial zone.

Located at the celestial equator, it can be seen from most parts of the Earth, between Gemini, Monoli, Canis Major, Taurus, Lepus, Pojiang and Canis Minor, and its northern part is immersed in the Milky Way. The main body of the constellation is composed of 4 bright stars such as Betelgeuse and Betelgeuse to form a large quadrilateral. In the center of the quadrilateral there are 3 bright stars arranged in a straight line, conceived as a belt around the hunter's waist, and under these 3 stars, there are 3 smaller stars, which are swords hanging from the belt. The whole image resembles a hunter standing majestically, with his head held high, which is very spectacular, and has been watched by people since ancient times. The constellation represents the hunter and there are two dogs at his feet (Canis Major and Canis Minor). As the Earth rotates, Orion chases the Pleiades across the sky. There are many bright stars in the constellation of Orion, but the most famous feature is the huge nebula M42 on Orion's sword, located south of the belt of Orion lined up by three stars.

Jia Hao paused and said, "Do you think he looks like a hunter holding a sword, does he look like him?" ”

"It's like it, it's really like it," everyone said in unison, looking at Orion.

Jia Hao then said: "There is an even more amazing thing, you see the three stars on Orion's waist, I can't tell whether it is a casual guest or four, and your reporter is currently in one direction." When he turns around and turns to a position in the middle, it is time for the New Year. ”

Again, after Jiahao finished speaking, everyone had a burst of admiration, and Jiahao suddenly felt that he was much taller.

"Jiahao, Jiahao, is that the Big Dipper, look, seven stars" Wanyu said by pulling Jiahao's arm.

Jiahao looked at it and said, "Yes, you still know the Big Dipper." Yes, and the Big Dipper plays an important role in helping us discern our direction. ”

The Big Dipper is made up of seven bright stars in the constellation Ursa Major, arranged in a bucket (or spoon) shape in the northern sky. It is often used as an important sign to indicate direction and to recognize the constellations. Because these seven stars are easily recognizable to stargazers, they become a distinct and important constellation.

Ursa Major is one of the arch signs. To the south of the constellation Draconus. Between Canis and Lynx. There are 151 stars in the constellation that are visually magnitude 6. Among them, there are 24 stars of 4th magnitude. The stars of Ursa Major are distributed in the image of a single Ursa Major. For observers in the mid-latitudes of the Northern Hemisphere, the constellation Ursa Major is visible year-round, but the full constellation is observed in spring.

In the Chinese, these stars in the Ursa Major chart are imagined as the image of a bear. In different latitudes of the Earth, the constellations that can be seen are different. Above 40° north latitude, where we are north of Beijing and Greece, the constellation Ursa Major can be seen all year round. But. In spring, the constellation Ursa Major is high in the northern sky, making it the best time of the four seasons to see it.

At this time, Jia Hao sighed and said, "Are you people waiting to see the meteor shower or do you want me to be tired to death, why are there so many questions?" ”

Everyone laughed, and Wang Tao said, "Look." You don't say how we know so much about astronomy, especially the solar system is so big, and I also yearn for the solar system.

Jia Hao then sighed and said: "The solar system is indeed very large, and the solar system and the Milky Way form a huge universe, which is really amazing." ”

Wanyu then asked: "Jiahao, what else do you know, you, I found that I admire you more and more, how can you understand everything, why didn't I find out before?"

Jiahao was speechless for a moment, so he looked at his phone and still had a little time to get to ten o'clock on the news, and while they were chatting and talking, it was already about nine o'clock and ten o'clock.

Jia Hao smiled and said: "There are still twenty minutes to see the meteor shower, and I am looking forward to it, in fact, I don't know anything, I like to explore, I like to study, what the Milky Way, the solar system, I feel that there are many mysterious things that make me unusually obsessed." ”

The solar system is a collection of the Sun's center and all the celestial bodies that are constrained by the Sun's gravity: 8 planets, at least 165 known moons, 5 identified dwarf planets, and hundreds of millions of small solar system bodies. These small bodies include asteroids, Kuiper Belt objects, comets, and interstellar dust. The planets in the solar system are, in order, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, in descending order from the Sun. Six of the eight planets are orbited by natural moons, and the planets in the outer solar system are also surrounded by a ring of dust and many small particles.

The solar system is a system of celestial bodies consisting of the sun, planets and their moons, asteroids, comets, meteors, and interplanetary matter, with the sun being the center of the solar system. In the vast family of solar systems, the mass of the Sun accounts for 99.8% of the total mass of the solar system, and the eight planets and tens of thousands of asteroids account for a tiny proportion. They orbit the sun for eternity, and at the same time, the sun generously and selflessly dedicates its light and heat to warm every member of the solar system, prompting them to develop and evolve constantly. In this family, the closest planet to the Sun is Mercury, followed outwards by Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

The Milky Way is a huge, disk-like system of stars and galactic matter, of which the Sun is a member. The light of the many stars in the Milky Way forms the Milky Way, which becomes an irregularly shaped band of light that surrounds the night sky. This band of astralism is roughly located on the plane of the silver plate. The Milky Way is one of the billions of galaxies that make up the universe. It has tens of billions of stars and a considerable amount of interstellar gas and dust. The Milky Way is typical of the spiral galaxies of the type of galaxy. Its core is surrounded by a large central nucleus with spiral arms wrapped around it. These curved spiral arms give the shape of the galaxy what it looks like a giant wheel. The spiral arm sinks evenly in the silver plate.

The silver disk is the main component of the Milky Way, with a diameter of about 70,000 light years. The silver nucleus shields the interstellar dust particles, and they absorb visible and ultraviolet light from the radiation of the silver nucleus. Therefore, the Milky Way is a cosmic object that is closely related to human beings.

The time is getting closer and closer to the moment of the meteor shower, Jiahao looked at his mobile phone and there were only less than 7 minutes left, Jiahao said to everyone: "There are still a few minutes before the meteor shower, you can pay attention to it, the historical astronomical landscape that is rare in a century is about to be revealed." ”

"Jiahao, Jiahao, you water, there will be a comet tonight, right?" Wanyu asked.

Jia Hao nodded and said, "Yes, the news says that there is a very high probability of seeing a broom star, that is, a comet." ”

Comets, commonly known as broom stars, are small celestial bodies in the solar system made of ice. When it is close enough to the Sun, it exhibits a coma (a thin, pasty, temporary atmosphere) and sometimes a comet tail. These phenomena are caused by a combination of solar radiation and solar wind acting on the comet nucleus. In the book "A Brief Treatise on Astronomy", it is written: "Comets are strange stars, with a beginning and an end. It is commonly known as the broom star after its shape. "People tend to blame the appearance of comets for disasters such as wars and plagues, but this has no scientific basis. As of January 2011, there are 4,185 known comets, of which about 1,500 are Cruz comets, and about 484 are short-period comets, and the number is steadily increasing.

Scientists estimate that comets, which are generally only a few astronomical units away from the Sun, will disintegrate within a few thousand years. In 1066, on the eve of the Norman invasion of England, Halley's Comet returned. At that time, people had mixed feelings about this strange celestial body with a long tail in the night sky, believing that it was a kind of warning and foreshadowing of war given by God. Later, when the Normans conquered England, the wife of the Norman commander embroidered the scene of Halley's Comet on a tapestry to commemorate the return of Halley's Comet. Chinese folk derogatorily refer to comets as "broom stars" and "disaster stars". There are many things like this that associate the appearance of comets with human wars, famines, floods, plagues, and other disasters in Chinese and foreign history. A comet is a small, small, cloud-like object that orbits the Sun in an oblate elongated orbit (very few in a near-circular orbit).

Some comets have even more spectacular finishes – either falling into the Sun or shattering into another planet or celestial body. In the early days of the solar system, collisions between comets and planets or moons were common: for example, there were many impact craters on the surface of Earth's moons, some of which may have been caused by comets. The most recent comet-planetary impact occurred in July 1994, when Shoemaker? Comet Levy 9 collided with Jupiter.

In the early stages, there were many comets and asteroids that entered the Earth as a result of collisions. Many scientists believe that the comet's bombardment brought a large amount of water to the young Earth (4 billion years ago), forming the oceans that currently cover the Earth, if not all, of them. But other researchers have questioned this theory. The detection of some organic molecules on comets has led some to speculate that comets or meteorites may have brought precursors to life on Earth – or even the organisms themselves. There are still many comets that are near-Earth comets, but the chance of an Earth collision with an asteroid is still higher than that of a comet.

It is suspected that a comet's impact, on a long-term scale, could also transport large amounts of water to Earth's moons, so there may be some lunar ice remaining.

Time is fleeting, there is only less than a minute left, Jiahao said to everyone: "The meteor shower is coming, everyone is ready to wait and see, haha, a rare moment in a century is coming." (To be continued......)