The graph below is Edwin Hubble\'s galaxy distance and velocity data from his 19

Question

The graph below is Edwin Hubble's galaxy distance and velocity data from his 1931 observing sessions. The red line is a best fit line through the data points, with the slope of the line representing the numerical value of Hubble's constant. The blue cross is a random point chosen along the best fit line. What is the value y-coordinate (radial velocity) value of that random data point? [Pick best answer]

25

27

15,000

555

1000

25

27

15,000

555

1000

Hubble & Humason (1931) 20,000 15,000 10,000 5000 0 1929 Data 10 20 30 Distance (Mpc)

Explanation / Answer

Option (c) is right.

The cordinates of blue cross is approximately (27, 15000) i.e. a galaxy which is 27Mpc far away from us is receding with velocity 15000 Km/s from us.

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