1924
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Events
- Harry Grindell Matthews attempts to demonstrate his "death ray" to the War Office.
- U.S. Army pilots complete the first aerial circumnavigation of the globe, taking 175 days and 74 stops.
- Astronomer Edwin Hubble announces that Andromeda, previously believed to be a nebula, is actually another galaxy.
He adds his theory that the Milky Way is only one of many such galaxies in the universe.
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