radhardened (
radhardened
) wrote
2020
-
02
-
17
07:59 pm
decommissioned hydrogen maser on display at the Arecibo Observatory Science & Visitor Center
from Flickr
https://flic.kr/p/2iuuRBH
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radhardened) wrote2020-02-17 07:59 pmradhardened) wrote2020-02-17 07:59 pm
