Lecture03 - Big Bang Black Holes No Math Dr Jonathan Asaadi...

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Big Bang, Black Holes, No Math Dr. Jonathan Asaadi Dr. Jonathan Asaadi Lecture 03 Lecture 03 More on the history of More on the history of science and the scientific science and the scientific method method Big Bang, Black Holes No Math Topic: History 1
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Upcoming important dates Big Bang, Black Holes No Math Topic: History 28 2 No Class (MLK Day) Lecture Canceled This lecture will be posted online (Blackboard) for you to view later (You will be responsible for the material posted online) Lecture as usual Lecture as usual We are here We are here
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Big Bang, Black Holes No Math Topic: History 28 3 Upcoming important dates Extra credit opportunity! Bring in your ticket and write one paragraph about the lecture Two ways to apply your extra credit (you choose) 5% increase on your first paper 3 attendance quizzes get full credit
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Big Bang, Black Holes No Math Topic: History 28 4 Last time .... Tour of the big things in the universe Tour of the small things in the universe Earth Sun Started to tell this story...
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Example of observation and intuition being at odds Single example to show the scientific method in action People have watched the sky and noticed that the stars (the dots of light in the sky) basically all move together over the course of the night and over years Five of them behave differently Start this story in the 2 nd century Big Bang, Black Holes No Math Topic: History 28 5
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Ptolemy’s Universe (2 nd century) Observe that the Sun, Moon and the other “wanderers” orbit the Earth in mostly circular paths Claudius Ptolemy was a Greco- Roman writer of Alexandria, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology Every so often the planets move backward for awhile Best guess: these are mini-orbits way out there (epicycles)… Hmmm…
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Ptolemy’s Universe (2 nd century) So Ptolemy just tweaked his model “Circles within circles” Explained these “wandering” stars The model needed to be tuned and reset from time to time Big Bang, Black Holes No Math Topic: History 28 7
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Looking at Mars in the Stars Big Bang, Black Holes No Math Topic: History 28 8
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Cracks in the `early cosmology’ In 1514, Copernicus wrote that Planets and Earth orbit the Sun Much simpler in some ways no epicycles More complicated in others Says Earth is rotating
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Ptolemy’s Universe Copernicus's Universe
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Epicycles???
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If we lived in the 1500’s, should we believe Copernicus? The Earth isn’t at REST and rotates? Shouldn’t we FEEL this? If the Earth is rotating, why don’t we fall off like an ant on a bicycle wheel? Why don’t we feel a wind as we rotate?
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  • Spring '14
  • Dr.JonathanAsaadi
  • Black Holes, Big Bang

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