Since then, however, the expanding-universe theory has largely been accepted by scientists worldwide. Hubble's work with Humason helped bolster the then-theory that the universe was expanding - a connection that Hubble ardently denied could be made with any certainty, and published his sentiments with the help of chemist Richard Tolman in the mid-1930s. The classification system for galaxies that he created (now known as the Hubble sequence) has been used by other researchers for nearly a century.

By showing that other galaxies existed, scientists had a better idea of the concept of the size of the universe and the possibility of other planets. Hubble's work in the field of astronomy was truly revolutionary. He had suffered a stroke that was caused by cerebral thrombosis and was 63 years old at the time. Hubble continued to conduct research at the Mount Wilson Observatory, as well as the Palomar Observatory in California, until he died on September 28, 1953. For his service during the war, in 1946, Hubble received the Medal of Merit. Hubble worked at Mount Wilson Observatory until 1942, when he left to work at the Aberdeen Proving Grounds in Maryland during World War II. In 1936, Hubble published The Realm of the Nebulae, a historical and explanatory piece on his research in the field of extragalactic astronomy. The two men's research was widely well-received. In other words, Hubble was stating that a galaxy's redshift is twice the size as another's when it's twice as far from another galaxy. He and Humason then published their research in 1929, theorizing that redshifts in galaxies' light emissions - which shows that galaxies are moving away from each other - move at a linear rate to the distance between them. In the early-mid-1920s, Hubble began conducting new research, along with fellow astronomer Milton Humason, on the galaxies' spectral shifts and unique distances, particularly looking at their relationship with the earth. The Andromeda Nebula was later renamed the Andromeda Galaxy. The Andromeda Nebula was later proven to be much farther away, at nearly 2.48 million light years (through further analyses of the spacial indications of stars' light). There had been no clear idea of the Milky Way's size at the time, and through his research, Hubble was able to estimate that the Andromeda Nebula (thought of simply as a spiral at the time) was nearly 900,000 light years away from the Milky Way, thus it had to be its own galaxy. While working at Mount Wilson, Hubble proved that other galaxies existed outside of the Milky Way, where Earth is located, by taking photos through the observatory's Hooker telescope and comparing the varying degrees of luminosity among Cepheid variable stars. Hubble studied nebulae for his doctorate, and he returned to this work at Mount Wilson, where he could make observations using the world’s largest telescope, the 100-inch (2.5 m) Hooker Telescope. He would remain there for the rest of his life. In 1919, aged 30, he began work at Mount Wilson Observatory in California, renowned for its clear air and excellent viewing conditions. He was a very popular teacher, but he did not enjoy it much. He also coached the school basketball team and did commercial German translation work. (age 64) Marshfield, Missouri, United StatesĪfter returning from the United Kingdom, Edwin Hubble got a job teaching Spanish and Physics at New Albany High School, Indiana.

Edwin hubble research on galaxies