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"Exploring the Universe" Small Particles and the Big Universe PPT Courseware
learning target
1. Know the relationship between the solar system, the Milky Way and the universe
2. Understand the history of human exploration of the universe and the history of human beings stepping out of the earth
3. Through the understanding of the structure of the universe, stimulate the desire for scientific knowledge and be willing to explore natural scientific phenomena
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, eight planets, at least 63 satellites, about one million asteroids, countless comets and interstellar matter.
1. The process of exploration
Human beings have long observed Mercury, Venus, Jupiter, Mars, and Saturn with the naked eye.
In 1543 AD, Copernicus proposed the "heliocentric theory."
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.
2. The vast starry sky
At present, there are about 1 billion celestial systems similar to the Milky Way that people have observed. These celestial systems are called galaxies. All galaxies make up the vast universe.
Overview of the Milky Way Galaxy
Composition: The Milky Way is a huge celestial system composed of many stars and interstellar matter. There are more than 200 billion stars like the sun.
Shape: The Milky Way in the side view is like a discus with a thick middle and thin sides; the Milky Way in the top view is like a large vortex, with four spiral arms extending from the center.
Size: The diameter of the Milky Way is approximately 100,000 light-years. The Sun is about 30,000 light-years away from the center of the Milky Way.
Speak freely
Some people think that the disappearance of the dinosaurs was caused by an asteroid hitting the earth. If this hypothesis is true, can you describe the situation at that time?
Meteor phenomenon: When some small solid pieces in the solar system break into the earth's atmosphere, they burn and emit light due to friction with the atmosphere and brighten the night sky.
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