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Hubble's 1929 linear fit to a scatter plot showing recession velocity vs distance for several galaxies.

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https://files.mastodon.social/media_attachments/files/109/377/758/363/003/455/original/2a5d1dad79469473.jpeg

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  1. Robert McNees (mcnees@mastodon.social)'s status on Sunday, 20-Nov-2022 19:36:05 UTC Robert McNees Robert McNees

    Astronomer Edwin Hubble was born #OTD in 1889.

    Hubble is best known for combining galactic distance measurements with Slipher’s redshift data to obtain a linear relation between distance and recession velocity. This is now understood as evidence for an expanding universe.

    Before that, Hubble used Henrietta Swan-Leavitt's period-luminosity relation for Cepheid variable stars to establish spiral nebulae as separate galaxies situated outside the Milky Way.

    In conversation Sunday, 20-Nov-2022 19:36:05 UTC from mastodon.social permalink
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