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GBT in the Hills

GBT in the Hills. National Radio Astronomy Observatory Green Bank, WV. Introduction. Measuring the Size and Age of the Universe. Introduction. You are an astronomer who has just made this image of the sky. As you study this image, what questions do you ask?. Introduction.

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GBT in the Hills

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  1. GBT in the Hills National Radio Astronomy Observatory Green Bank, WV

  2. Introduction Measuring the Size and Age of the Universe

  3. Introduction You are an astronomer who has just made this image of the sky. As you study this image, what questions do you ask?

  4. Introduction What are these “fuzzy” objects? How were they formed? What are they made of? Are they moving? Are they part of a system? How far away are they?

  5. galaxy data 1

  6. Gas Spectra Neon Sodium Hydrogen

  7. Radio Spectra Radio Spectral Line Hydrogen NGC 628

  8. Galaxy data 2

  9. Doppler Shift Doppler Shifts

  10. Expansion The Expanding Universe

  11. Assumptions • If we assume: • All spiral galaxies are similar in size to the Milky Way. • Spiral galaxies are 10 kpc in radius. Then we can estimate the distance to these galaxies.

  12. Galaxy distance R Angular size Distance TAN angle = OppositeAdjacent = Radius Distance Distance = Radius TAN angle

  13. Our dv graph

  14. Age of Universe Hubble Constant Slope = V/D D 1 = x D T 1/T = H 1/H = Time!!!

  15. Calculating H and T

  16. answer So, What is the Age of the Universe? About 11 BY

  17. Sky&Tele 2 August, 1999 October, 1999

  18. Distance Ladder Distance Ladder

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