"The Vast Universe" Particles and Universe PPT Courseware 3

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"The Vast Universe" Particles and Universe PPT Courseware 3

Universe: the totality of material phenomena. In a broad sense, it refers to the infinitely diverse and eternally developing material world, and in a narrow sense, it refers to the largest celestial body system that can be observed in a certain era. The latter is often called the observable universe, our universe, which is now equivalent to the "total galaxy" in astronomy.

the birth of the universe

The boundary of the universe we observe now is approximately more than 10 billion light-years. It is composed of many galaxies. The Earth is an ordinary planet in the solar system, and the solar system is an ordinary star in the Milky Way. How did the stars, planets, comets, galaxies, etc. we observe come into being? The cosmology theory holds that the universe we observe was concentrated in a small, extremely hot and extremely dense primordial fireball in its early stages of development. Between 15 billion and 20 billion years ago, there was a big explosion in the original fireball, which began the history of the birth of our universe.

0.01 seconds after the original Big Bang, the temperature of the universe was approximately 100 billion degrees. The main forms of matter are electrons, photons, and neutrinos. After that, the material diffuses rapidly and the temperature decreases rapidly. One second after the big bang, it dropped to 10 billion degrees. 14 seconds after the big bang, the temperature was about 3 billion degrees. After 35 seconds, at 300 million degrees, chemical elements begin to form. The temperature continues to drop and atoms continue to form. The universe is filled with gas clouds. Under the influence of gravity, they formed star systems, and the star systems evolved over a long period of time to become today's universe.

solar system

There are eight planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Except for Mercury and Venus, other planets have satellites orbiting them. The Earth has one satellite, the moon, and Saturn has the most satellites, with 17 confirmed. Planets, asteroids, comets and meteoroids all revolve around the central celestial body, the sun, and form the solar system. The sun accounts for 99.86% of the total mass of the solar system, and its diameter is about 1.4 million kilometers. The diameter of the largest planet, Jupiter, is about 140,000 kilometers. The size of the solar system is approximately 12 billion kilometers.

Milky Way

There is evidence that other planetary systems exist outside our solar system. 250 billion stars similar to the sun and interstellar matter constitute a larger celestial system - the Milky Way. Most of the stars and interstellar matter in the Milky Way are concentrated in an oblate spherical space, which looks like a "discus" when viewed from the side, and looks like a vortex when viewed from the front. The diameter of the Milky Way is about 100,000 light-years. The sun is located in one of the spiral arms of the Milky Way, about 30,000 light-years away from the center of the Milky Way. There are many similar celestial systems outside the Milky Way, called extragalactic galaxies, often referred to as galaxies. Approximately 1 billion have been observed.

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"The Vast Universe" PPT Courseware on Particles and the Universe 2:

"The Vast Universe" Particles and Universe PPT Courseware 2 Preview Tips: 1. The first person in the world to propose the use of fluid hydrogen and liquid oxygen as rocket engine propellants was ( ) A Tsiolkovsky B Gaga Lin C. Armstrong D. Yang Liwei 2. The following are said about the earth...

"The Vast Universe" PPT courseware on particles and the universe:

"The Vast Universe" PPT courseware on particles and the universe Teaching objectives 1. Know the composition of the solar system. 2. Understand the history of human exploration of the universe. 3. Understand the general situation of the universe and the Big Bang theory. 1. Concept of the Universe The solar system is an ordinary star in the Milky Way..

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Update Time: 2024-10-08

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