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Announcements. Lab 15: Hubble’s Law. Tiffany Pewett pewett@chara.gsu.edu. Distance Ladder. Edwin Hubble. Redshift. Hubble’s Law. Hubble’s Constant. Goal of Lab. Find distances and recessional velocities of galaxies. Determine Hubble’s Constant.

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**Lab 15: Hubble’s Law**Tiffany Pewett pewett@chara.gsu.edu**Goal of Lab**• Find distances and recessional velocities of galaxies. • Determine Hubble’s Constant. • Determine Age and Radius of the Universe! • Current known values?**Finding Velocities**• You first need to find your scale for the spectral images. • Then measure the distance to the Calcium K & H lines to nearest ½ mm. • Fill in the Table I using the appropriate equations. • Note: Round your final velocities to nearest 1000!**Scale & Velocities**5015.7 Å 3888.7 Å**Finding Distances**• Determine scale for galaxy images. • Measure longest and shortest sides of galaxies and average them. • Measure to edge of each galaxy. • Fill in Table II using appropriate equations.**Plotting**• Carefully Plot all five of your data points. • Final Velocity vs. Distance. • Use a ruler to draw a “best-fit” line starting at the origin (0,0) through your points.**Hubble’s Constant**• Hubble’s constant is the slope of the line you just drew. • Slope= Rise ÷ Run • Origin is 0,0 so you only need one point. • Find a spot on your line that is on a grid cross-section. Find the y and x values here, you have your rise and your run!

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