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"Exploring the Universe" Small Particles and the Big Universe PPT Courseware 3
What does the vast universe look like? What do the stars and nebulae we see when we look up every day look like?
The solar system was formed 4.6 billion years ago with the formation of the sun. The solar nebula gradually condensed due to its own gravity, and gradually formed a celestial system composed of multiple celestial bodies arranged according to certain rules. The members of the solar system include one star, nine planets, at least 63 satellites, about one million asteroids, countless comets and interstellar matter.
How did humans gradually understand the solar system?
Human beings have long observed Mercury, Venus, Jupiter, Mars, and Saturn with the naked eye.
In 1543 AD, Copernicus proposed the "heliocentric theory of geostrophe".
In 1609 AD, Galileo Galilei used a homemade astronomical telescope to reveal the mystery of the solar system for the first time.
In 1781, British scientist William Herschel discovered Uranus.
In 1846, Le Verrier of France and Adams of England discovered Neptune.
In 1930, Tombaugh of the United States discovered Pluto.
discuss
There used to be a large number of dinosaurs on the earth, but then they suddenly and mysteriously disappeared. Some people think that it was caused by an asteroid hitting the earth. Talk about your opinions.
Halley's Comet
1. What are comets mainly composed of?
2. What parts can a comet be divided into?
3. Which comet is the most famous comet? How many years is its revolution period?
4. Halley’s Comet last returned in 1986. When is the next year Halley’s Comet will visit the Earth?
Giant planets: Jupiter, Saturn
Common characteristics: farther from the sun than terrestrial planets, large volume and mass, low average density, and low surface temperature. Mainly composed of hydrogen, helium, neon and other substances. There are many satellites and halos.
Far-solar planets: Uranus, Haitian Star, Pluto
Common characteristics: They are far away from the sun, their average density is between the first two types of planets, and their surface temperatures are the lowest at -200°C. The surface gases are mainly hydrogen and methane (it is unclear whether there is an atmosphere on the surface of Pluto). There are satellites, and Uranus and Neptune have rings.
discuss
Why is there life on earth in the solar system? Other planets have no life
The conditions for the formation of life are:
①The moderate distance between the sun and the earth allows the existence of liquid water on the earth.
②The size of the earth is moderate, and the gravity generated can attract various gases in the atmosphere.
Operation
Collect information about my country's astronomical achievements and the impact of the development of aerospace technology on human life through popular science books, magazines or related websites, and compile a tabloid
Read more popular science books to broaden your knowledge
Workbook, synchronization
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