Nasa's James Webb Telescope that could spot extra-terrestrial life has completed a critical series of tests in anticipation of its launch in early summer 2019.
The $8.8 billion (£6.5bn) telescope has been successfully tested in a giant vacuum chamber at the Johnson Space Centre - proving it will function in deep space.
Engineers are now confident it will be able to capture starlight in focus and track astronomical targets describing the completion of tests as a 'significant milestone'.
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