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Karl Jansky standing in front of his large, rotating directional radio antenna. It looks like a large scaffold mounted on old Ford Model-T wheels. Jansky is wearing a white shirt with the sleeves rolled up, and what appear to be breeches gathered just below the knee, with high, dark socks.

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Karl Jansky standing in front of his large, rotating directional radio antenna. It looks like a large scaffold mounted on old Ford Model-T wheels. Jansky is wearing a white shirt with the sleeves rolled up, and what appear to be breeches gathered just below the knee, with high, dark socks.
https://files.mastodon.social/media_attachments/files/110/984/637/224/033/654/original/d01875e1173f8437.jpeg

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Robert McNees (mcnees@mastodon.social)'s status on Thursday, 31-Aug-2023 14:12:53 UTC Robert McNees

Karl Jansky invented the field of radio astronomy #OTD in 1932.
During a solar eclipse he saw no change in the faint radio hiss he'd been monitoring, which ruled out the sun as a source. He soon attributed this "star noise" to large ionized gas clouds near the center of the Milky Way.

In conversation about a year ago from mastodon.social permalink