| Category | Format | Size |
|---|---|---|
| Guangdong and Shanghai version of eighth grade physics volume 2 | pptx | 6 MB |
"Depths of the Universe" From Particles to Universe PPT Courseware
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"Depths of the Universe" From Particles to Universe PPT Courseware
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Light year is a unit of length, indicating the distance that light travels in one year, symbol: ly
1ly=9.46×1012km
Assuming that a person walks at a speed of 5.4km/h, it would take a person 200 million years to travel a distance of 1 light-year, and the longest life span of a person is only 100 years.
The astronomical unit is also a unit of length, indicating the distance between the earth and the sun. Symbol: AU
1AU=1.5×108km
scale of the universe
There are approximately hundreds of billions of galaxies in the observable universe (total galaxies), each with approximately 100 billion stars. The current observable range is approximately 3.0x1010ly.
The Milky Way is a huge galaxy formed by more than 300 billion stars, called the "Milky Way". Its range is approximately 1.0×105ly (light-year), which is equivalent to 9.46×1017km.
Such a beautiful galaxy, such a beautiful space in the universe, how was it formed?
Based on their own observations and analysis, scientists arrived at the "Big Bang Theory", which is the origin of the universe.
Develop new homes and find new human friends
In 1971, the former Soviet Union launched the first space station in human history, the Salyut, to understand the universe and explore its mysteries from places other than the earth.
In 1969, Neil Armstrong and three other American astronauts landed on the moon for the first time aboard Apollo 11.
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For more information about the PPT courseware "From Particles to the Depths of the Universe", please click the From Particles to the Universe ppt Depths of the Universe ppt tag.
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Update Time: 2024-07-24
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