The Big Bang, red-shift and the expanding Universe

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Question 16
Easy

Astronomers studying the expansion of the Universe have plotted the recession velocities of several distant galaxies against their distance from Earth.

This relationship is shown in the graph below:

A scatter graph titled 'Galaxy Recession Velocity vs. Distance'. The horizontal x-axis is labelled 'Distance (Mpc)' with a scale from 0 to 80, in major increments of 10. The vertical y-axis is labelled 'Recession Velocity (km/s)' with a scale from 0 to 6000, in major increments of 1000. A straight line of best fit starts at the origin (0,0) and passes exactly through the points (20, 1400), (40, 2800), and (60, 4200). Several data points are plotted closely clustered around this line of best fit.

Use the graph to estimate the recession velocity of a galaxy located at a distance of 40 Mpc from Earth.

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

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