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Why do telescopes need the help of a gravitational lens?

gravitational help Lens telescopes
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Why do telescopes need the help of a gravitational lens?

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The object is so far away, observing it in such detail would tax the capabilities of both Hubble and Keck without the magnification of the gravitational lens provided by a foreground cluster of galaxies that is much closer to us, at 5 billion light-years.

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