Palomar Observatory Prime Focus Tour

Greenstein climbs from the elevator into the open top of the prime focus cage.

Riding the elevator to the top of the parked telescope.

[audio]

"Each time you go up, you carry a lot of paper. You carry some photographic plates in a tiny little box, and you carry a whole set of dreams of what the object you're going to work on is going to turn out to be."

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