Scientists celebrate as giant space telescope's mirror moves into place

Engineers from Nasa and the European Space Agency celebrated as the last part of the James Webb space telescope's folding mirror moved into place on Saturday. The move means the telescope could soon be operational and ready to explore the depths of the universe. The seven-tonne telescope cost £7.4 billion to build and send to its orbiting position, a million miles from earth. It is the largest space telescope ever constructed, and is around 100 times more powerful than its predecessor, the Hubble space telescope. When it is operational scientists hope the telescope will be able to see light from the universe's earliest stars and galaxies, formed 3.7 billion years ago.

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