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"Earth's Cosmic Environment" Viewing the Earth from the Universe PPT Download (Lesson 1: The Universe)
Part One: Learning Objectives
1. Understand the main types of celestial bodies and the levels of celestial body systems, and describe the earth’s cosmic environment.
2. Understand the earth’s position in the universe through the relationship diagrams of celestial systems at different levels.
Earth’s cosmic environment PPT, part 2: sort out the teaching materials and lay a solid foundation
1. Celestial bodies
1. Concept
There are a variety of materials in the universe, such as nebulae, stars, _____, satellites, comets, _______, interstellar matter, etc. These materials are collectively called celestial bodies. Among them, _____ and _____ are the most basic celestial bodies.
2. Common types
(1) Stars: composed of ________, have huge mass, can emit ___ and ___ themselves, and are actually in constant motion.
(2) Nebula: _______ celestial body composed of gas and dust material. The density is small, but the volume and mass are large.
(3) Planet: refers to a spherical celestial body that does not emit its own light and moves around _____ along a fixed _______ orbit.
(4)Meteoroid
(5) Comet: A celestial body orbiting the sun. It is large in size, low in density, and has a cloudy appearance. The orbit of most comets is an elongated _____ shape. The revolution period of Halley's Comet is about __ _Year.
2. Celestial System
1. Concept
Celestial bodies attract and _____ each other, forming celestial body systems of different levels.
2.Level
Earth’s cosmic environment PPT, the third part: focus on exploration and improvement of literacy
Research point: Judgment of celestial bodies and celestial body systems
Inquiry guide
There are three famous meteor showers in the northern hemisphere. Among them, the Geminid meteor shower has stable flow, long maximum duration and many bright meteors, making it very suitable for observation by Chinese astronomy enthusiasts. The 2019 Geminid meteor shower will reach its peak on December 14, with an hourly zenith flow of about 140 meteors. Answer the following questions accordingly.
1. Based on the schematic diagram, determine whether the objects in the diagram are celestial bodies and explain the reasons.
Answer: Meteoroids are celestial bodies. Meteoroids run in space and exist outside the atmosphere, so they are celestial bodies. Meteors are not celestial bodies. Meteorites are the remnants of meteors that fell to the earth before burning up. Because they do not exist outside the atmosphere, they are not celestial bodies. Meteors are not celestial bodies, because meteors are a phenomenon in which meteoroids break into the earth's atmosphere, generate heat due to friction with the atmosphere, and burn and glow. It is a natural phenomenon, not a celestial body.
2. Is Gemini a celestial system? Why?
The answer: No. Celestial bodies attract each other and revolve around each other to form a celestial body system. There is no relationship between the various celestial bodies (stars) that make up Gemini, so they are not a celestial body system.
3. Read the picture below and think about what celestial systems currently recognized by humans from high to low?
Answer: From high level to low level, they are the observable universe, A. Milky Way, B. Solar system, and C. Earth-Moon system.
Methods and techniques
1. The "Three Looks" method skillfully determines celestial bodies
Let’s see if it is the form of existence of matter in the universe. Matter is a celestial body, but phenomena are not celestial bodies. For example, interstellar matter is a celestial body even though it is invisible to the naked eye.
Second, see if it is part of a certain celestial body. A part of a celestial body cannot be called a celestial body. For example, the rocks on the surface of the moon are part of the moon, not a celestial body.
Third, check whether it is located outside the earth's atmosphere. For example, a spacecraft is a celestial body when it is operating in space, but it is not a celestial body when it returns to the ground.
2. "Two essentials" to judge celestial body system
(1) To attract each other: There is universal gravitation between celestial bodies. Generally, there should be a mutual attraction relationship between the celestial bodies that constitute a celestial system.
(2) They must revolve around each other: celestial bodies that only attract but do not revolve cannot form a celestial body system.
Track training
Read "Schematic diagram of the Perseid meteor shower landscape" and answer questions 1 to 2.
1. The meteoroid shown in the picture belongs to
A. Celestial bodies orbiting the Earth
B. Celestial objects orbiting the sun
C. Celestial body orbiting the moon
D. Celestial objects outside the solar system
2. Most of the meteoroids rushing towards the earth are burned up in the atmosphere, and their geographical significance is
A. Increase the average temperature of the earth's surface
B. Reduce the damage of ultraviolet rays to living things on earth
C. Reduces the impact of small celestial bodies on the earth’s surface
D. Keep the temperature difference between day and night on the earth’s surface from being too large
Earth’s cosmic environment PPT, Part 4: Class drills and knowledge implementation
1. Which of the following are celestial bodies?
① Halley’s Comet, meteoroids ② Moon, nebulae ③ Space shuttle, meteorites ④ Stars, space shuttle to be launched
A.①③ B.①② C.②④ D.③④
2. Which of the following can constitute a celestial system?
①The Earth and the Sun ②The Big Dipper ③The Earth and the Moon ④The stars in Cassiopeia ⑤The Earth and Mars
A.①③ B.①② C.②④ D.③④
3. The names of the celestial systems represented by A, B, C and D in the figure are respectively
A. Extragalactic galaxy, Milky Way, solar system, Earth-Moon system
B. Milky Way, Extragalactic Galaxy, Solar System, Earth-Moon System
C. Solar system, extragalactic galaxy, Milky Way, Earth-Moon system
D. Milky Way, Solar System, Earth-Moon System, Extragalactic Galaxy
4. From the perspective of the celestial system level, A, B, C, and D belong to the same level.
A.A and B B.C and D
C. B and C D. B and D
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"Earth's Cosmic Environment" Viewing the Earth from the Universe PPT Courseware (Lesson 1 Cosmic Sun) Part One Content: Course Standard Explanation 1. Understand different types of celestial bodies and their characteristics, understand the levels of celestial body systems, and be able to describe the earth's position in the universe . (Comprehensive thinking) 2. Knowing and remembering too...