How the Universe Works - Ninth Season English Subtitles

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First there was light,
visible light.

2
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Then, we viewed the universe
in radio waves and X-rays.

3
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Ever since
there's been astronomy,

4
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we've been looking at
different kinds of light

5
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and opening up the universe
a little bit more of the time.

6
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But then in 2015, like,
the roof came off.

7
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Something happened
that changed everything,

8
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the ability to see waves
in space and time itself.