lecture 3 - emergence of life

lecture 3 - emergence of life - FOR PHOTO WRITE IN BIG,...

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FOR PHOTO WRITE IN BIG, BOLD LETTERS : FIRST LAST NAME FUN FACT
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Aug. 12, 2007. Ralph Alpher, a physicist whose pioneering work on the underpinnings of the "Big Bang" theory went unheralded for years while others won a Nobel Prize, has died. He was 86. As a doctoral candidate at George Washington University, Alpher and Johns Hopkins University physicist Robert Herman theorized in 1948 that the expansion of the universe leaves behind radiation and traces of the initial explosion that gave it birth could still be found. Evolution in the News
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The "Big Bang" theory holds that the universe began billions of years ago in the explosion of a single, super-dense point that contained all matter. According to the Big Bang model, the universe developed from an extremely dense and hot state. Space itself has been expanding ever since, carrying galaxies (and all other matter) with it.
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Hoyle, supported a competing theory to the Big Bang Model, the steady state model. In this model, new matter would be created as the universe seemed to expand. It is an irony that Hoyle coined the name that would come to be applied to Lemaître's theory. He referred to it sarcastically as "this big bang idea" during a radio broadcast.
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The Big Bang Theory is the dominant scientific theory about the origin of the universe. According to the big bang, the universe was created sometime between 10 billion and 20 billion years ago from a cosmic explosion that hurled matter and in all directions. The big bang was initially suggested because it explains why distant galaxies are traveling away from us at great speeds. The theory also predicts the existence of cosmic background radiation (the glow left over from the explosion itself). This is the radiation that Alpher discovered.
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The Big bang Theory was confirmed in 1964 by the observations of Bell Laboratories astronomers. The Bell scientists had been trying to solve a problem of microwave "noise" at a radio antenna in New Jersey when they discovered the noise was the remnant of Big Bang radiation predicted by Alpher and Herman. The Bell astronomers, Arno Penzias and Robert Wilson, shared the 1978 Nobel Prize in physics, along with a Soviet scientist. A map of the sky at microwave frequencies, showing that the CMB is almost completely the same in all directions.
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Hubble image shows an infant galaxy forming nearby, which means this happened very recently on the cosmological timescale. This is evidence that the Universe is not quite finished with galaxy formation yet.
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ASSIGNMENT 1 EVOLUTION IN THE NEWS In groups of 2 or 3 students present “Evolution in the News.” REQUIREMENTS: 1) Minimum 5 Power point slides presenting: 2) An event in the recent news (ideally in the past month- but the news can be up to 6 months old) that pertains to evolutionary biology. ****Email me your topic by 6 pm the day before class so that we don’t have
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lecture 3 - emergence of life - FOR PHOTO WRITE IN BIG,...

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