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"Solar System" PPT Courseware 3
What does solar system mean?
Nine major planets, asteroids, comets and other celestial bodies revolve around the sun in certain orbits to form the solar system.
These celestial bodies are not chaotic, but are arranged in an orderly manner and move regularly.
All nine planets orbit the sun from west to east.
What is the central object of the solar system? Why?
The central object of the solar system is the sun.
The mass of the sun accounts for 99.86% of the total mass of the solar system, and other celestial bodies orbit the sun.
1. What are the two largest planets in the solar system?
What are their greatest features?
The names of the two largest planets are: Jupiter and Saturn
They have common characteristics: a solid core and an atmosphere several kilometers thick, large size, many satellites, and a halo.
2. What is the brightest planet in the solar system?
Venus
3. Which planet in the solar system has the most satellites?
saturn
4. The asteroid belt is located between which two planets?
Mars and Jupiter
5. Briefly describe whether the eight planets have atmospheres and their characteristics.
meteoroid
some small solid pieces in the solar system
Meteors: When meteoroids approach the Earth's orbit, some are captured by the Earth's gravitational field. When they rush into the Earth's atmosphere, they burn with friction, producing a flash of light called a "meteor."
Meteoroids that have not burned up and fall to the earth's surface are called meteorites.
The reason why there is life on the earth is mainly due to the existence of the following conditions:
1. The earth is at a moderate distance from the sun, so that the temperature on the earth ranges from 0 degrees to 100 degrees. This is the temperature range in which water can exist in a liquid state. If the temperature is too high, more than one hundred degrees, the atoms cannot combine together to form molecules because the thermal disturbance is too strong. If the temperature is too low, the molecules will clump together tightly and can only exist in solid form, and living things cannot survive.
2. The size and mass of the earth are moderate. Give the planet an atmosphere suitable for life to breathe. If the planet's volume and mass are too large, its gravity is too strong, and its atmospheric pressure is too high, living things will not be able to adapt to survive. If the volume and mass are too small, its various gases will escape into space, making it difficult for an atmosphere to form. In addition, the atmosphere also needs various substances suitable for the formation of organisms, such as carbon, hydrogen, oxygen, nitrogen, etc.
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