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I read it here
"current instruments don't allow astronomers to peer back at the universe's birth"

what does it mean? kindly, answer with details.
Thank you so much, in advance.
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The word is used with its normal meaning: http://www.macmillandictionary.com/dictionary/american/peer_1
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to look carefully

. . .to peer back at the universe's birth

. . . to look carefully at something that happened in the past