The Big Bang, red-shift and the expanding Universe

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Question 27
Medium

A student uses the line of best fit on the graph in Figure 3 to determine the Hubble constant (H0H_0H0​) and estimate the age of the Universe.

A graph of recessional velocity in km/s plotted on the y-axis against distance from Earth in Mpc on the x-axis. Data points represent various galaxies and show significant scatter around a straight line of best fit that passes through the origin.

Explain why the gradient of this line only provides an estimate of the age of the Universe.

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The Big Bang, red-shift and the expanding Universe Questions

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