Which learned society elected Edwin Hubble as a member in 1929?

Which learned society elected Edwin Hubble as a member in 1929? The answer is the American Philosophical Society.

Founded in Philadelphia in 1743, the American Philosophical Society is one of the oldest learned societies in the United States. Its membership has included prominent scientists, inventors, physicians, and public intellectuals. Hubble’s election recognized his growing importance as an observational astronomer.

The 1929 election came soon after Hubble’s landmark work demonstrating that many objects then called nebulae were actually galaxies beyond the Milky Way. His measurements helped transform astronomy from a study of stars within the Milky Way into modern extragalactic astronomy. He was also elected to the U.S. National Academy of Sciences in 1927.

A common mix-up is confusing the American Philosophical Society with the Royal Society, the historic British learned society. Hubble did receive many international honors, but the society named in this 1929 record was the American Philosophical Society.