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B1 中级 英语 4:11 Educational

Solar System 101 | National Geographic

National Geographic · 37,513,915 次观看 · 添加于 2 个月前

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字幕 (74 片段)

00:02

- [Narrator] Our solar system is one

00:04

of over 500 known solar systems

00:06

in the entire Milky Way galaxy.

00:10

The solar system came into being

00:11

about 4.5 billion years ago, when a cloud

00:15

of interstellar gas and dust collapsed,

00:17

resulting in a solar nebula, a swirling disc

00:20

of material that collided to form the solar system.

00:25

The solar system is located

00:27

in the Milky Way's Orion star cluster.

00:30

Only 15% of stars in the galaxy host planetary systems,

00:34

and one of those stars is our own sun.

00:40

Revolving around the sun are eight planets.

00:43

The planets are divided into two categories,

00:45

based on their composition,

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