1 季节
46 插曲
Crash Course Astronomy - Season 1 Episode 23 第 23 集
Today Phil helps keep you from ticking off an astronomer in your life by making sure you know the difference between a meteor, meteorite, and meteoroid. When the Earth plows through the stream emitted by a comet we get a meteor shower. Meteors burn up about 100 km above the Earth, but some survive to hit the ground. Most of these meteorites are rocky, some are metallic, and a few are a mix of the two. Very big meteorites can be a very big problem, but there are plans in the works to prevent us from going the way of the dinosaurs.
- 年: 2015
- 国家:
- 类型: Documentary
- 工作室: YouTube
- 关键词: astronomy
- 导向器:
- 投: Phil Plait
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