科学与环境

How to see the Orionid meteor shower this weekend

来源: feeds.bbci.co.uk · 发布于

How to see the Orionid meteor shower this weekend
来源: feeds.bbci.co.uk

Friday sees the start of the Orionid meteor shower as Earth passes through debris left behind by Halley’s Comet. It peaks later in October.

Friday sees the start of the Orionid meteor shower as Earth passes through debris left behind by Halley’s Comet. It peaks later in October.

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Ancient sea levels reveal when the Earth's poles went wandering
科学与环境

Ancient sea levels reveal when the Earth's poles went wandering

Earth's poles do not always stay in the same place. For example, a region once near the North Pole can end up near the equator, and an area near the equator can shift up toward the pole. This is known as true polar wander (TPW), and it's when Earth's crust and mantle shift togeth

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