astro091511 - Astronomy September 15th, 2011 The Observable...

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Astronomy September 15 th , 2011 The Observable Universe Several lines of evidence indicate that the universe is ~14 billion years old: The Hubble Law The ages of stars This means that the greatest distance we can observe is 14 billion light years. This is the limit of the observable universe . We cannot make any measurements as to what came before the Big Bang. A comment about our origins. .. The most distant stuff that we can observe contains only hydrogen and helium. No carbon, nitrogen, oxygen, etc. Carbon, Hydrogen, Oxygen, Nitrogen. Stars – hydrogen + hydrogen => helium + ________ => carbon, nitrogen, oxygen, iron. .. All the carbon that we are made of was once deep inside a star. Stars – nuclear reactions Your ancestors may surprise you. In the early history of the Universe, there was nothing but hydrogen and helium. All other elements were manufactured deep inside stars Einsten's (Weird) Universe Einstein's “ Special Theory of Relativity”
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astro091511 - Astronomy September 15th, 2011 The Observable...

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