Many of the fundamental questions that have occupied astronomers over the last 50 years are being addressed by the James Webb Space Telescope. It is one of the most expensive engineering projects ever attempted, costing $10 billion. Our understanding of distant planets and deep time is already being revolutionized by the James Webb Space Telescope.

You must first grind a mirror the size of a house in order to look back in time and see the first stars shine. If the mirror were the size of a continent, its surface must be so flat that there would be no hills or valleys higher than ankle height.

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