"Exploring the Universe" Universe PPT Courseware 2

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"Exploring the Universe" Universe PPT Courseware 2

1. Overview of the Milky Way Galaxy

Composition: The Milky Way is a huge celestial system composed of many stars and interstellar matter. There are 100 billion to 200 billion stars like the sun.

Shape: The Milky Way in the side view is like a discus with a thick middle and thin sides; the Milky Way in the top view is like a large vortex, with four spiral arms extending from the center.

Size: The diameter of the Milky Way is approximately 100,000 light-years. The Sun is about 30,000 light-years away from the center of the Milky Way.

Do the math: How many kilometers is 1 light year?

1 light year = 365×24×60×60×300000

=9 460 800 000 000 kilometers = 9460.8 billion kilometers

Light year is a unit of length.

The diameter of the Milky Way is approximately 100,000 light years

How big is our known universe?

Now people have used astronomical telescopes to observe the depths of the universe 12 billion light years away from us, but they still have not seen the edge of the universe. Moreover, scientists have discovered that the universe is in its youth, still growing and expanding!

2. A vibrant universe

Many stars are born every moment in the universe, and many stars die at the same time.

Black hole is a very mysterious celestial body. Its volume is small, but its density is astonishingly high, with tens of billions of tons or more per cubic centimeter. Because of its high density, its gravity is also particularly strong. No matter what it is, as long as it is sucked in, it cannot "climb" out. Even the fastest light cannot escape the huge gravitational pull of the black hole.

Because black holes emit no light themselves, they are invisible to any powerful telescope. Despite this, most scientists still believe that there are many black holes in the universe. When a massive star evolves to its later years and undergoes a supernova explosion, it may collapse into a black hole. In the early universe, some small black holes also formed. The volume of a small black hole is only the size of an atomic nucleus, its mass is about the same as a mountain, reaching hundreds of millions of tons, and the energy contained in it is equivalent to 10 large power stations.

Our country’s brilliant achievements in space exploration:

Our country is recognized as the birthplace of rockets in the world.

In 1970, my country's first artificial satellite was launched into space.

In 1999, the Shenzhou spacecraft was launched.

In 2003, Shenzhou 5 carried Yang Liwei into space.

On October 24, 2007, "Chang'e-1" took off.

Our country has become the third major space power after Russia and the United States.

The gap between my country and developed countries

Americans were able to land on the moon in 1969, but we still need 20 years. The American probe is already on Mars, and our probe has just arrived on the moon. Our aerospace technology is still far away from the world's powerful countries. Yes, it requires the efforts of our generation after generation.

Humanity pays a price for exploring the universe

Due to the complexity of manned spaceflight engineering, it must be an undertaking full of risks and challenges. So far, 22 astronauts have sacrificed their precious lives. However, mankind will never stop moving forward in its journey of exploring space, and a glorious future will surely greet explorers.

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For more information about the "Cosmos Exploring the Universe" PPT courseware, please click the Universe PPT Exploring the Universe PPT tab.

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Update Time: 2024-11-24

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