Learning Adventures of the Eastern Sierra Nevada

California Institute of Technology Radio Observatory
Since 1958, north of Big Pine, the two 90-foot parabolic dishes of the Cal Tech radio telescopes can be seen (there are now several additional newer instruments as well).  In its first two years of operation, this facility discovered more stars than all other radio observatories of that time combined!

Here's a really fun time-lapse video of the Observatory:

'Big Ears' in the eastern Sierra searching for answers to galactic mysteries - John Bartell, 5:12 PM PDT August 2, 2019

Here's the full WikiPedia page about Caltech's Owen's Valley Radio Observatory: