Play video 3 again, by clicking here. When you have done, close the video window by clicking on EXIT.

Did you see how the galaxy was made in a glass?

To repeat this demonstration, you need a glass of water and a spoon to stir the water with. You also need a pot of DOUBLE cream. Work in PAIRS.

Stir the water and get your partner to have a spoonful of cream ready. As soon as you take the stirring spoon out dribble the cream in (quite quickly) so that it dribbles in the centre of the water. It will begin to develop spiral arms and spread out all on its own.

Now swap roles and repeat, then watch the video again. Did you do as well as in the video?