Lecture 4 - Light and Matter I

Lecture 4 - Light and Matter I - Light and Matter I...

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Light and Matter I ASTRONOMY 3 Lesson 4 1 Multi-wavelength view of the Milky Way, starting from radio waves at the top, over infrared and optical light data, down to X-ray and Gamma-ray views. For more details, see http:// adc.gsfc.nasa.gov/mw/mmw_edu.html
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NATURE of the Universe Review of Lesson 3 Astronomy - Light and Matter I • Galileo’s observations of the phases of Venus could not be explained by the geocentric model . • Planets orbit the Sun on elliptical orbits . This is a natural consequence of Newton’s law of gravity. The force of gravity F is inversely proportional to the square of the distance r ( F = G * m 1 * m 2 / r 2 ) • According to Kepler’s 3rd law, objects closer to the Sun need less time (shorter periods P ) to complete one orbit than objects in orbits with larger semimajor axis a : P 2 is proportional to a 3 2
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NATURE of the Universe Questions from Lesson 3 Astronomy - Light and Matter I • Does light have a color? • Do stars have colors? Think about (questions from Lesson 3): 3
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• The Electromagnetic spectrum (Ch. 2.1, 2.3) • Wave-properties of Light (Ch. 2.2) • Thermal radiation (Ch. 2.4) • Announcements: Extra Credits, Feedback to Homework and Labs, Studying, . .. NATURE of the Universe Today’s Topics Astronomy - Light and Matter I 4
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NATURE of the Universe The Electromagnetic Spectrum Astronomy - Light and Matter I What might these guys have to celebrate? George F. Smoot (UCB) John C. Mather (NASA) 5 See http://nobelprize.org/nobel_prizes/physics/laureates/2006/info.pdf for more details on the research awarded with the Nobel prize. We will learn more about the significance of their discovery near the end of the term.
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NATURE of the Universe The Electromagnetic Spectrum Astronomy - Light and Matter I What might these guys have to celebrate? George F. Smoot (UCB) John C. Mather (NASA) They won the 2006 Nobel Prize in Physics (announced on Oct 3) for their observations of the Universe shortly after the Big Bang , when is was only 400,000 yr old. Map of the microwave background radiation based on the Cosmic Background Explorer 5 See http://nobelprize.org/nobel_prizes/physics/laureates/2006/info.pdf for more details on the research awarded with the Nobel prize. We will learn more about the significance of their discovery near the end of the term.
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NATURE of the Universe The Electromagnetic Spectrum Astronomy - Light and Matter I White light is composed of light with d i f f e r e n t colors . 6
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NATURE of the Universe The Electromagnetic Spectrum Astronomy - Light and Matter I Is there more to light than meets the “eye”? 7 Learn more about Herschel’s experiment at http://coolcosmos.ipac.caltech.edu/ cosmic_classroom/classroom_activities/herschel_experiment.html
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NATURE of the Universe The Electromagnetic Spectrum Astronomy - Light and Matter I Is there more to light than meets the “eye”?
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This note was uploaded on 10/13/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 4 - Light and Matter I - Light and Matter I...

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