A stereo movie created by NASA researchers shows the altitude of the Tonga plume during the eruption
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@emsque: Exactly #40YearsAgo Doug Geisler was asleep atop Manastash Ridge Observatory. An astronomy grad student, he'd just logged his first excellent night at the telescope for his PhD thesis. He was the only person on the summit, ~90 miles from #MountStHelens... #MSH40