30th Day of December

1924 – Formal announcement of the existence of other galactic systems

At that time, the prevailing view of the cosmos was that the universe consisted entirely of the Milky Way Galaxy.

On the 30th December, 1924 Astronomer Edwin Hubble formally announces existence of other galactic systems at meeting of the American Astronomical Society

Using the Hooker Telescope at Mt. Wilson, Hubble identified Cepheid variables (a kind of star that is used as a means to determine the distance from the galaxy) in several spiral nebulae, including the Andromeda Nebula and Triangulum.

1924 - Formal announcement of the existence of other galactic systems

His observations, made in 1924, proved conclusively that these nebulae were much too distant to be part of the Milky Way and were, in fact, entire galaxies outside our own.

This was suspected by researchers at least as early as 1755 when Immanuel Kant’s General History of Nature and Theory of the Heavens appeared.

This idea had been opposed by many in the astronomy establishment of the time, in particular by Harvard University-based Harlow Shapley.

Hubble’s findings fundamentally changed the scientific view of the universe. Supporters state that Hubble’s discovery of nebulae outside of our galaxy helped pave the way for future astronomers.

Extra Note: Hubble’s results for Andromeda were not formally published in a peer-reviewed scientific journal until 1929.

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2 thoughts on “30th Day of December

    1. It’s my pleasure, I find these facts interesting and something positive, which we all need a bit of these days. Once again make sure you have a great new years eve, and lets pray that we have a wonderful new year which brings us positive happy future, Cheers, ๐Ÿ˜œ

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