Lecture19 - Signature Course UGS 303 (Fall 2009) Edwin P....

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1 The History and Philosophy of Astronomy (Lecture 19: Hubble II) Instructor: Volker Bromm The University of Texas at Austin Department of Astronomy Signature Course UGS 303 (Fall 2009) Edwin P. Hubble: Mariner of the Nebulae 1889 (Missouri) – 1953 (Pasadena) • leading observational astronomer of 20 th century: - discovers galaxies (1924): Milky Way but one of innumerable “island universe” - expansion of the universe (1929): Hubble ʼ s Law: v = H 0 x d Mount Wilson Observatory • 1919 onwards: world ʼ s largest telescope Mount Wilson Observatory George Hale (1868-1938) 100-inch Hooker Telescope
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2 Classifcation oF Nebulae (=galaxies) 1923: Tuning-Fork diagram Big Q: How do the Spiral Nebulae Move? • fgure out radial velocities by taking spectra, and measure the shiFt oF spectral lines Doppler eFFect! The Doppler EFFect (1842) blueshiFt redshiFt Christian Doppler (1803-53) The Doppler EFFect For Spectral Lines • Calculate radial speed: • By measuring the shiFt in wavelength oF spectral lines, one can fgure out radial velocity oF source with high precision!
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3 The Flight of the Spiral Nebulae (1912) Vesto M. Slipher (1875-1969)
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This note was uploaded on 12/18/2010 for the course UGS 303 taught by Professor Foster during the Spring '08 term at University of Texas at Austin.

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Lecture19 - Signature Course UGS 303 (Fall 2009) Edwin P....

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