William Wallace Campbell was born #OTD in 1862. A pioneer of astronomical spectroscopy, he made many measurements of stellar radial velocities. He was the director of Lick Observatory. en.wikipedia.org/wiki/William...

William Wallace Campbell was born #OTD in 1862. A pioneer of astronomical spectroscopy, he made many measurements of stellar radial velocities. He was the director of Lick Observatory.
en.wikipedia.org/wiki/William...

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Bluesky post by @francoislevrier.bsky.social