"Exploring the Universe" Infinite Universe PPT courseware

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"Exploring the Universe" Infinite Universe PPT courseware

The journey of mankind’s understanding of the solar system

Human beings have long observed Mercury, Venus, Mars, Jupiter, 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.

The use of space probes since the 1950s has brought mankind's understanding of the solar system into a new era.

Mercury is the closest to the sun, so it is very hot. It can be as high as 400 degrees Celsius during the day, but drops to minus 170 degrees Celsius at night, which is very similar to the situation on the moon. Moreover, Mercury has no atmosphere on its surface, so it is cratered (with craters) by meteorites.

Venus has an atmosphere on its surface, but its main component is carbon dioxide. In ancient China, it was called Changgeng, Qiming, Taibai or Taibai Venus. Sometimes it appears in the eastern sky before dawn and is called "Qiming"; sometimes it appears in the western sky after dusk and is called "Chang Geng".

Mars is a fiery red planet. There is an atmosphere on the surface, mainly composed of carbon dioxide. It is thin and cold, with sand and dust suspended in it, and dust storms often occur every year. The gravel-strewn, desolate and silent surface of Mars is dotted with craters and pits caused by impacts caused by meteorites.

Its most striking topographic feature is the dry river bed.

Jupiter is the largest planet in the solar system. Its volume can accommodate more than 1,300 Earths and its mass is more than 300 times that of the Earth. There is a solid rock core and no solid surface.

The surface is filled with liquid hydrogen.

The most striking feature of Jupiter is the brightly colored Great Red Spot in the southern hemisphere, which is actually a large whirlpool in Jupiter's atmosphere.

The surface of Jupiter is a violently moving atmosphere. The atmospheric circulation forms belt-like patterns. Each belt-like pattern is parallel to the equator. Jupiter has rings.

Why is there life on earth in the solar system? And other planets have no life?

The conditions for the formation of life are:

1. The moderate distance between the sun and the earth allows the existence of liquid water on the earth;

2. The size of the earth is moderate, and the gravity generated can attract various gases in the atmosphere.

The eight planets in the solar system

1. Mercury, the planet closest to the sun

2. The planet farthest from the sun most of the time—Neptune

3. The largest planet—Jupiter

4. The brightest planet—Venus

5. The most suitable planet for life—Earth

6. The planet most similar to the Earth and known as the “red planet”—Mars

Milky Way

1. Composition: A huge celestial system composed of stars (more than 200 billion stars like the sun) and interstellar matter.

2. Size: The diameter of the Milky Way is about 100,000 light-years.

The solar system is located on a spiral arm of the Milky Way, about 30,000 light-years away from the center of the Milky Way.

Light years are commonly used as units in astronomy

3. Please look at the two pictures above. What is the shape of the Milky Way?

Viewed from the side: The Milky Way is like a discus with a thick middle and thin sides.

Viewed from above: Like a large whirlpool with four spiral arms extending from it

See the Milky Way across the night sky from Earth.

Which of the following celestial system affiliations is correct ( )

A Earth-Moon System→Solar System→General Galaxy

B Milky Way→Solar System→Universe

C Milky Way→Solar System→Earth-Moon System

D Solar system→Earth-Moon system→Milky Way

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Update Time: 2024-10-02

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 2 industry PPT template

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