Telescopes not only enable people to see the structure of today's universe, but also to travel back in time almost to the Big Bang 13 billion years ago. The Hubble Space Telescope provides a completely new perspective on the universe. Its successor, the James Webb Space Telescope, will even look deep into the early days of the universe. In this episode of Spacetime, we take an in-depth look at the instruments used by space explorers.

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