"Exploring the Universe" Universe PPT Courseware 4

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"Exploring the Universe" Universe PPT Courseware 4

starry sky world

1. Stars: People look up at the vast starry sky. After careful observation, they find that the positions of most stars seem to remain unchanged. People call these stars stars. In fact, they are not absolutely motionless, and their relative positions are also changing. Their movements can be observed with precise astronomical instruments.

2. Milky Way: Among the twinkling stars in the clear night sky, there is a light belt that stretches across the sky. It is a huge celestial system composed of stars and diffuse matter, called the Milky Way. The sun is one of the hundreds of billions in the Milky Way. One of the stars.

3. Other galaxies: Other galaxies appear as fuzzy patches in the sky. The galaxy next to the Milky Way is the Andromeda Galaxy, which is more than 2 million light-years away from us.

4. Universe: There are as many as 100 billion galaxies scattered in the universe.

People realize that the universe is a hierarchical structure system of celestial bodies.

life span of star

There is only one factor that determines the life of a star - mass!

The greater the mass, the shorter the life!

15 times the mass of the sun 10 million years

1 times the mass of the sun 10 billion years

0.2 times the mass of the sun 1 trillion years

The sun can live for 10 billion years, but Sirius only has a lifespan of a few million years. Proportionally speaking, if the sun lives seventy years, Sirius can only live three days!

where does the universe come from

Regarding the origin of the universe, most scientists agree that the universe was born in a big bang about 13.7 billion years ago.

The Big Bang universe model believes that the universe began with a "primordial fireball". In the "primordial fireball", the temperature and density were unimaginably high, and the state of matter at this time cannot be described yet. This state may be extremely unpredictable. Stable, and eventually, the "primordial fireball" explodes. This explosion is holistic and involves all matter, time, and space in the universe. The explosion causes the universe to expand everywhere, and the temperature drops accordingly. When the temperature drops to a certain level, it gradually forms Super galaxy clusters, galaxy clusters, galaxies, even stars and planets, etc.

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"Exploring the Universe" Universe PPT download:

"Exploring the Universe" Universe PPT Download Part One: The Expanding Universe The solar system is a celestial system centered on the sun, the star, and composed of planets, satellites, dwarf planets, small celestial bodies (including asteroids, comets), etc. In the sky we observe...

"Exploring the Universe" Universe PPT:

"Exploring the Universe" Universe PPT Part 1: Introduction to the new lesson. Recall, what kind of galaxy is the solar system? Is the solar system unique in the universe? The solar system is centered on the sun, the star, and consists of planets, satellites, dwarf planets, and small celestial bodies (including small...

"Exploring the Universe" PPT courseware:

"Exploring the Universe" PPT courseware Part One: The Origin of Constellations 1. Ancient Babylon connected some bright stars in the sky with imaginary lines and gave them mythical images, which they called: constellations. 2. The ancient Greeks divided the sky into 48 constellations. 3.Ancient times..

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Update Time: 2024-11-22

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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