Hubble's Law is usually dealt with very theoretically at school level, rather than practically. This is inevitable, to an extent, but runs the risk of not emphasising to pupils how empirical a discovery it was.
The activity below allows pupils to see exactly how the data is gathered and do their own measurements - which allows them to appreciate the limitations on it - and ultimately to get a value for the Hubble Parameter and hence the age of the Universe. If you build this up in the right way, 'measuring the age of the universe' is a pretty impressive outcome for a paper-based school activity.
- The first pdf file has the images of the galaxies and their spectra on it - definitely best printed at A3 size to make the measurements more accurate.
- The second pdf takes you through the technique of exactly what needs to be measured and in what order, and has a table to fill in as you go along.
- The Excel file contains my measurements for comparison together with a graph and all the calculations.