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.
The word is used with its normal meaning: http://www.macmillandictionary.com/dictionary/american/peer_1
Students: Are you brave enough to let our tutors analyse your pronunciation?
to look carefully

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

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