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Leavitt found a connection between how often Cepheid variable pulsed and its brightness. A Cepheid variable is a star whose magnitude changes throughout its life.
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Einstein publiches his highly regarded Theory on relativity. The theory says that acceleration distorts the shape of time in space. This theory is still used in today's study of the cosmos.
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Einstein wins the Nobel Prize for science for his work with light. His discovery was called the photelectric effect. It stated that light is made particles called photons
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Hubble identified Cepheid variables in stars. By doin so he was able to see that these stars were many many light years away outside of the milkyway galaxy. This dispproved the previously accepted theory which theorized that the milkyway galxy took up the entire universe.
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Hubble uses the redshift to figure that the galaxies are moving away from each other. This was the first big proof for the Big Bang Theory. Einstein had thought of the idea previously but had thought it impossible since there was not enough evidence at the time. Einstein later visits Hubble that the decision to leave his theory out of the theory of General Relativity was the biggest mistake of his life.
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Stephen Hawking is born in England. He is born exactly 300 years after the death of Galileo Galilee. He went on to Oxford to study physics and went into the study of cosmology.
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Hartmann proposes his collision theory. The theory says that a large body collided with the earth and the remaining debris solidified into the body we know as the moon. This theory is widely accepted as what actually occured.
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Carl Sagan creates a 13 part series of shows. They are about the universe and galaxies and cosmology in general. The show did a lot to popularize science, astronomy in particular.
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Stephen Hawking is appointed the head Lucasian Mathamatics Professor at Cambridge University. This is a very prestigious title as the same post's second holder was Sir Isaac Newton. Cambridge was the school Hawking had attended.
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The book was a international best seller. The book aimed to explain the beginning of the universe and the supposed end. Hawking did this all in a way that a lay person could comprehend it.
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In honor of Edwin Hubble, NASA launches the Hubble Space Telscope. The Hubble Space telescope is not the first telescope to be launched into space. However, it is the largest and most versatile.
