"In a letter written in 1924, who wrote ""You will be interested to hear that I have found a Cepheid variable in the Andromeda Nebula"" and transformed our view of the universe forever?"
Cepheid variable She published it in 1912 with further evidence. In 1913, Ejnar Hertzsprung conducted research on Cepheids. His research would later require revision, however. In 1915, Harlow Shapley used Cepheids to place initial constraints on the size and shape of the Milky Way, and of the placement of our Sun within it. In 1924, Edwin Hubble established the distance to classical Cepheid variables in the Andromeda Galaxy, until then known as the "Andromeda" "Nebula", and showed that the variables were not members of the Milky Way. Hubble's finding settled the question raised in the "Great Debate" of whether the Milky Way
The Andromeda Nebula The Andromeda Nebula The Andromeda Nebula () is a 1967 Soviet Science fiction film starring Sergei Stolyarov and directed by Yevgeni Sherstobitov at the Dovzhenko Film Studios. The film was originally intended to be the first episode of a series of films, alternatively titled as "The Andromeda Nebula: Episode I. Prisoners of the Iron Star", but the remaining parts were never made due to Stolyarov's death. It is based upon the "Andromeda Nebula" novel by Ivan Yefremov and follows the story of a group of humans on the spaceship "Tantra" who are tasked with investigating the home planet of an