"Solar System" PPT Courseware 2

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"Solar System" PPT Courseware 2

The boss of the solar system-the sun

The mass of the sun is 1.989 billion billion tons. By mass, hydrogen accounts for about 71%, helium accounts for 27%, and other elements account for 2%. Through a telescope, we can directly observe the sun's atmosphere, which is divided into three layers: photosphere, chromosphere and corona from the inside out. The sun's huge energy comes from its core, which is less than 500,000 kilometers in diameter. The temperature in the core part is extremely high and the pressure is extremely high, and a nuclear energy reaction, that is, thermonuclear fusion, occurs. Huge amounts of energy are released in this process, and it is estimated that the sun can burn for 10 billion years.

Eight planets

The eight planets, including the Earth, form a planetary system that revolves around the sun - the main members of the solar system. The planet itself generally does not emit light, but shines by reflecting sunlight from its surface. There is clear relative movement of the planets against a sky background composed mainly of stars. The planet closest to the sun is Mercury, followed in order by Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Based on the fact that planets originate from different forms of matter, the nine planets can be divided into three categories: terrestrial planets (water, metal, earth, and fire), giant planets (wood, earth), and abysmal planets (Uranus, Neptune).

☆Mercury★Venus☆

Dust covers the rolling mountains, fault cliffs thousands of meters high stretch for hundreds of kilometers, and there are large and small craters everywhere. The sun appears two and a half times larger than it does on Earth, but the surrounding sky is pitch black.

Venus has no water at all and is surrounded by a thick carbon dioxide atmosphere. There are thick sulfuric acid clouds floating in the sky, and the atmospheric pressure is equivalent to 92 times that on Earth. The surface temperature is as high as more than 400 degrees Celsius, which is hotter than Mercury, the planet closest to the sun.

☆Mars★ Jupiter☆

Mars is the planet most similar to Earth in the solar system. Although it is extremely cold and dry, and the main component of the atmosphere is carbon dioxide, those criss-crossing river beds seem to tell us that there was life on Mars a long time ago.

As the largest planet in the solar system, Jupiter can fit over a thousand Earths. It has more than a dozen satellites, just like a small solar system. The ever-changing colorful stripes and churning clouds and storms reveal Jupiter's changeable weather system.

blue earth

Earth's structure

movement of earth

The earth is a beautiful, blue sphere with a diameter of 12,800 kilometers. The entire earth is not a homogeneous body, but has an obvious spherical structure. After thousands of years of exploration, it was not until Copernicus established the heliocentric theory in the 16th century that humans generally realized that the earth is one of the planets orbiting the sun.

The composition, density, temperature, etc. of each sphere of the earth are different. The Earth's sphere is divided into two parts: the Earth's outer circle and the Earth's inner circle. The Earth's outer circle can be divided into four basic layers, namely the atmosphere, hydrosphere, biosphere and lithosphere; the Earth's inner circle can be divided into three basic layers, namely the mantle, the outer core liquid sphere and the solid inner core. In addition, there is an asthenosphere between the outer circle of the earth and the inner circle of the earth, which is a transitional layer between the outer circle of the earth and the inner circle of the earth. In this way, the entire earth includes a total of eight layers, including the lithosphere, The asthenosphere and the Earth's inner sphere together form what is known as the solid Earth.

Earth's rotation

The earth rotates from west to east around its axis, with an average angular speed of 15 degrees per hour. At the Earth's equator, the linear speed of rotation is 465 meters per second. The phenomenon of various celestial bodies in the sky rising in the east and setting in the west is a reflection of the earth's rotation.

Earth's revolution

In 1543, the famous Polish astronomer Copernicus first fully proposed the concepts of the Earth's rotation and revolution in his book "On the Revolutions of the Celestial Bodies". The orbit of the Earth is elliptical. The semi-major diameter of the orbit is 149,597,870 kilometers. The eccentricity of the orbit is 0.0167. The average orbital speed of the Earth is 29.79 kilometers per second. The intersection angle between the orbital plane (ecliptic plane) and the Earth's equatorial plane is 23°27' is called the yellow-red intersection angle. The rotation of the earth produces changes in day and night on the earth, and the rotation of the earth and the existence of the yellow-red angle cause the alternation of the four seasons.

A space station refers to a spacecraft that can stay in space for a long time. It is also called an "orbital station." Astronauts can live on the space station for long periods of time and conduct various scientific observations and experiments. By docking with manned and unmanned spacecraft, the space station can obtain supplies and exchange astronauts.

The space shuttle is a spacecraft that can travel freely between space and the ground. It is a trinity combination of rocket, spacecraft and aircraft, including an orbiter and an external fuel tank.

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"Solar System" universe PPT teaching courseware:

"Solar System" Universe PPT teaching courseware Part One: Review of the previous section 1. When do solar and lunar eclipses generally occur in the lunar calendar? What moon phase? 2. What are the types of solar and lunar eclipses? 3. Try to explain the reasons for the solar eclipse in your own words. 4...

"Solar System" universe PPT download:

"Solar System" Universe PPT download Part 1: Introduction of new lessons In addition to the earth and the moon, what other celestial bodies do we know that are moving around the sun? What are the characteristics of these celestial bodies? How are they arranged? ... ... ... Solar system PPT, second...

"Solar System" Universe PPT:

"Solar System" Universe PPT Part 1 content: Understand that the solar system is centered on the sun, including the eight major planets that revolve around it (including satellites that revolve around the planets), dwarf planets, and small celestial bodies (including asteroids, meteors, comets, etc.) The system is called...

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Update Time: 2024-10-19

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

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