Henrietta Swan Leavitt's 1912 discovery of the period-luminosity relationship in Cepheid variable stars established a fundamental method for measuring cosmic distances. Harlow Shapley subsequently ...
The discovery that the universe extends beyond the Milky Way galaxy was a pivotal moment in astronomy. In 1925, astronomer Edwin Hubble identified a Cepheid variable star, known as V1, in the ...
Delta Cephei, the archetype Cepheid variable star, is located in the constellation Cepheus, a circumpolar constellation visible in the northern sky. Delta Cephei's position can be determined relative ...
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