"Infinite Universe" PPT courseware 2

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"Infinite Universe" PPT courseware 2

cosmic secrets

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.

Scientific view of the universe:

The universe is a hierarchical structure system of celestial bodies.

The moon revolves around the earth

The eight planets including the earth rotate around the sun, and the stars are also moving.

We have already understood that the solar system is a celestial system centered on the sun, a star, and composed of eight planets, dwarf planets, small celestial bodies (including asteroids, comets), etc.

Most of the stars we observe in the sky are stars that shine and heat like the sun, and some of them will form a celestial system similar to the solar system.

During stargazing, the shining band of Milky Way light we see in the sky is actually a star group composed of many stars, which is called the Milky Way. The Milky Way is composed of approximately 100 billion to 200 billion stars and has a diameter of 100,000 light-years.

The propagation speed of light is 300,000 kilometers per second. A light-year is the distance traveled by light in a year. It is a unit used to measure the distance between stars.

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!

low mass stars

The outer shell of the red giant star slowly dissipates

The central core compresses into a white dwarf star

When the white dwarf cools down, it becomes a black dwarf.

massive stars

After a series of nuclear reactions, they took on the structure of an onion

Without the energy to resist gravity, a supernova explodes

The outer layer was blown away and the remaining core was compressed

Neutron star (1 billion tons/cm3)

black hole

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.

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

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"Exploring the Universe" Infinite Universe PPT courseware:

"Exploring the Universe" Infinite Universe PPT courseware The process of human understanding of the solar system Human beings have observed Mercury, Venus, Mars, Jupiter, and Saturn with the naked eye very early. In 1543 AD, Copernicus proposed the heliocentric theory. In 1609 AD, Galileo Galilei used his homemade astronomical telescope...

"Solar System" Infinite Universe PPT courseware:

"Solar System" Infinite Universe PPT Courseware Geocentric Theory The Egyptian astronomer Ptolemy proposed the geocentric theory after conducting astronomical observations in Alexandria. (At that time, the telescope had not yet been invented in the Ptolemaic era, and some astronomical observations were mainly made with the naked eye.) Observed...

"Infinite Universe" PPT courseware:

"Infinite Universe" PPT courseware The shining stars in the sky are collectively called celestial bodies. We divide celestial bodies into stars, comets, planets, satellites, galaxies, etc. How many stars are there in the sky? How big is the sky that contains celestial bodies? Celestial bodies and the sky constitute the universe, so the origin of the universe...

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Update Time: 2024-10-03

This template belongs to science courseware E-education edition sixth grade science volume 2 industry PPT template

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