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Text Chapter 418 Watching the Stars Together (Part 2)

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    Seeing this, Jiahao shook his head helplessly and said, "No, do you want me to introduce you one by one? Look there and look at the direction of my finger." Orion, one of the equatorial constellations.  Located between Gemini, Monoceros, Canis Major, Taurus, Lepus, Eridanus and Canis Minor, its northern part is immersed in the Milky Way.  The main body of the constellation consists of four bright stars, including Betelgeuse and Rigel, forming a large quadrilateral.  The best month for observation is January.  The Herschel Space Observatory has discovered chemical fingerprints of potentially life-forming organisms in the Orion Nebula.  Orion (O-Sun) is the most magnificent constellation in the sky and one of the equatorial constellations.  Located at the celestial equator, it can be seen from most areas of the earth, specifically between Gemini, Monoceros, Canis Major, Taurus, Lepus, Eridanus and Canis Minor. Its northern part is immersed in the Milky Way.  The main body of the constellation consists of four bright stars, including Betelgeuse and Rigel, forming a large quadrilateral.  There are three bright stars in a straight line in the center of the quadrilateral, which are imagined to be the belts tied around the hunter's waist. In addition, below these three stars, there are three small stars, which are the swords hanging on the belts.  The whole image is like a majestic hunter standing with head held high, very spectacular and has attracted people's attention since ancient times.  The constellation represents the hunter, and at his feet are two dogs (Canis Major and Canis Minor).  As the Earth spins, Orion chases the Pleiades star cluster across the sky.  There are many bright stars in Orion, but the most famous feature is the huge nebula M42 on Orion's sword, located south of the three stars that form Orion's belt.  Jiahao paused and said, "Do you think he looks like a hunter holding a sword?" "It looks like it, it really looks like it," everyone said in unison, looking at Orion.  Jiahao then said: "There is another more amazing thing. Have you seen the three stars around the waist of Orion? It's a bit unclear whether they are individual stars or four stars. You reporters are currently in one of his directions. When he  After turning around and turning to the middle position, it¡¯s time to celebrate the New Year. ¡°Once again, after Jiahao finished speaking, everyone burst into gasps of admiration, and Jiahao suddenly felt that he was much taller.  "Jiahao, Jiahao, is that the Big Dipper? Look, there are seven stars." Wanyu said, holding Jiahao's arm.  Jiahao took a look and said: "That's right, you also know the Big Dipper. It's true, and the Big Dipper plays an important role and can help us identify the direction." The Big Dipper is made up of seven bright stars in the constellation Ursa Major.  Composed of stars arranged in a bucket (or spoon) shape in the northern sky.  It is often used as an important symbol to indicate direction and understand constellations.  Because these seven stars are easier to identify to stargazers, they form a distinct and important constellation.  Ursa Major is one of the arctic constellations.  South of Draco.  Between Canes Canes and Lynx.  There are 151 stars in the constellation with visual magnitudes brighter than 6th magnitude.  There are 24 stars brighter than magnitude 4.  The stars of Ursa Major are distributed into the image of a big bear.  For observers at mid-latitudes in the Northern Hemisphere, Ursa Major is visible year-round, but the full constellation must be observed in the spring.  In China, people imagine these stars in the Ursa Major star chart as the image of a big bear.  In different latitude areas on the earth, the constellations that can be seen are different.  In areas above 40¡ã north latitude, that is, north of Beijing and Greece, Ursa Major can be seen all year round.  but.  In spring, Ursa Major is high in the northern sky, which is the best time of the year to watch it.  At this time, Jiahao sighed and said: "Are you people going to wait to see the meteor shower or are you going to tire me out? Why are there so many questions?" Everyone laughed and Wang Tao said: "Look. Don't tell me.  How do we know so many things in astronomy, especially since the solar system is so big? I also yearn for the solar system. Jiahao then sighed and said: "The solar system is indeed very big. The solar system and the Milky Way form a huge one."  Big universe, this is really amazing.  " Wanyu then asked: "Jiahao, what else do you know? I find that I admire you more and more. How come you know everything? I never noticed it before." Jiahao was speechless at once, so  After looking at his phone, there was still a little time until ten o'clock as mentioned on the news, and while they were chatting, it was already around nine o'clock or ten. Jiahao smiled and said, "There are still twenty minutes.  I'm really looking forward to seeing the meteor shower. In fact, I don't know anything. I like to explore and study the Milky Way and the solar system. I feel that there are many mysterious things that make me extremely obsessed with them.  "The solar system is centered on the sun and is a collection of all celestial bodies bound by the sun's gravity: 8 planets, at least 165 known satellites, 5 identified dwarf planets and hundreds of millions of small solar system objects.  These small objects include asteroids, Kuiper Belt objects, comets and interstellar dust.??The distance from the sun, the planets in the solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.  Six of the eight planets are surrounded by natural satellites, and the planets outside the solar system are also surrounded by planetary rings composed of dust and many small particles.  The solar system is a celestial system composed of the sun, planets and their satellites, asteroids, comets, meteors and interplanetary materials. The sun is the center of the solar system.  In the huge solar system family, the mass of the sun accounts for 99.8% of the total mass of the solar system, and the eight major planets and tens of thousands of asteroids account for a negligible proportion.  They revolve around the sun along their own orbits for eternity. At the same time, the sun generously and selflessly contributes its light and heat, warming every member of the solar system and promoting their continuous development and evolution.  In this family, the planet closest to the sun is Mercury, followed in order outward by Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.  The Milky Way is a huge, disk-shaped system composed of stars and galaxy matter, and the sun is a member of this system.  The light from the many stars in the Milky Way forms the Milky Way, an irregular luminous band surrounding the night sky.  This band of starlight lies roughly on the plane of the galactic disk.  The Milky Way is one of the billions of galaxies that make up the universe.  It contains tens of billions of stars and considerable amounts of interstellar gas and dust.  The Milky Way is a typical example of a spiral galaxy among galaxy types.  Its core is surrounded by a large central bulge with spiral arms surrounding it.  These curved arms give the Milky Way the appearance of a giant wheel.  The spiral arms sink evenly into the silver plate.  The Galactic Disk is the main component of the Milky Way, with a diameter of about 70,000 light-years.  The galactic core is shielded by interstellar dust particles, which absorb visible and ultraviolet light from the galactic core's radiation.  Therefore, the Milky Way is a cosmic body that is closely related to human beings.  The time was getting closer and closer to the time when the meteor shower was coming. Jiahao looked at his phone and saw that there were less than 7 minutes left. Jiahao said to everyone: "There will be a meteor shower in a few minutes. You can pay attention.  A rare and historic astronomical sight is about to be revealed. "Jiahao, Jiahao, there will be a comet tonight, right?" Wanyu asked.  Jiahao nodded and said: "Yes, the news said that it is very possible to see a broom star, which is a comet." Comet, commonly known as a broom star, is a small celestial body in the solar system made of ice.  When it is close enough to the Sun, it exhibits a coma (a thin, fuzzy, temporary atmosphere) and sometimes a tail.  These phenomena are caused by the combined effects of solar radiation and solar wind on the comet nucleus.  In the book "A Brief Introduction to Astronomy", he wrote: "Comets are strange stars with a beginning and a tail. The common name is called a broom star because of its shape." People often blame wars, plagues and other disasters on the appearance of comets.  , but this has no scientific basis.  As of January 2011, there were 4,185 known comets, of which approximately 1,500 were of the Cruz family and approximately 484 short-period comets, and this number is steadily increasing.  Scientists estimate that comets that generally approach the sun only a few astronomical units away will disintegrate within a few thousand years.  In 1066 AD, on the eve of the Norman invasion of England, Halley's Comet returned.  At that time, people had mixed emotions and stared at this strange celestial body with a long tail in the night sky, thinking it was a warning and omen of war given by God.  Later, when the Normans conquered Britain, the wife of the Norman commander embroidered the scene of the return of Halley's Comet on a tapestry to commemorate it.  Chinese people derogatorily call comets "broom stars" and "disaster stars".  There are many things like this that connect the appearance of comets with human wars, famines, floods, plagues and other disasters in Chinese and foreign history.  A comet is a small cloud-like celestial body with a small mass that orbits the sun in an elongated orbit (very few in a near-circular orbit).  Some comets have more spectacular endings - 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 satellites were common: for example, there are many impact craters on the surface of Earth's satellites, some of which may have been caused by comets.  The most recent comet-planet collision occurred in July 1994, when the shattered Comet Shoemaker-Levy 9 collided with Jupiter.  In the early stages, many comets and asteroids entered the Earth due to collisions.  Many scientists believe that comet bombardments brought large amounts of water to the young Earth (4 billion years ago), forming a large portion, if not all, of the oceans that currently cover the planet.  But other researchers have cast doubt on this theory.  The detection of some organic molecules on comets has led some to speculate that comets or meteorites may have brought the precursors of life to Earth - or even life itself.  There are still many near-Earth comets, but the probability of the Earth colliding with an asteroid is still higher than that of comets.  People suspect that comet impacts can also transport large amounts of water to Earth's satellites over long time scales, so some lunar ice may remain.    Time flies, and there is less than a minute left. Jiahao then says to everyone: "The meteor shower is coming, everyone is ready to wait and see, haha, a once-in-a-century moment is coming." (To be continued.)  Please search Piaotian Literature, the novels will be better and updated faster!
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