Ask Ethan: When A Photon Gets Redshifted, Where Does The Energy Go? https://t.co/zgB8thW0GZ https://t.co/zgB8thW0GZ
— iPhoneMaster13 (@iPhoneMaster13) December 27, 2015
from Twitter https://twitter.com/iPhoneMaster13
December 27, 2015 at 10:20AM
via IFTTT
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