
Episode 1: Explaining Gravity
The Science of Everything Podcast
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The Law of Inertia Explained
According to Newton's laws, an object always tends to go in the same direction at traveling. The velocity that enables us to happen is called the escape velocity. In order to get anything into orbit we have to accelerate them to the escape velocity of the Earth. And so that's why you need massive rockets to get into orbit and that's why it's so expensive.
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