What is Nostr?
Robert McNees /
npub188w…3emc
2024-08-04 17:05:46
in reply to nevent1q…9d63

Robert McNees on Nostr: Henrietta Swan Leavitt’s period-luminosity relation for Cepheid variable stars ...

Henrietta Swan Leavitt’s period-luminosity relation for Cepheid variable stars allowed Edwin Hubble (building on work by Vesto Slipher, and relying on contributions by others) to establish that so-called “spiral nebulae” were in fact separate galaxies outside our Milky Way.

https://mastodon.social/@mcnees/111681499901380126
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