There is a minimum size of meteorite that will make it through the atmosphere of a planet (or the Moon) and impact on the surface. If the meteorite is any smaller than this, it will burn up on its journey through the atmosphere and be seen as a meteor or shooting star (obviously if the meteorite is bigger it will still be able to impact with the surface). Students will begin by looking at the idea that planets such are our own Earth, are impacted (hit) by objects from space. This is done by using the student worksheet ‘Making an Impact’ or via a class discussion. Students will then work through the ‘Making an Impact’ student activity sheet. They will need to solve equations, think logically about the impacting process, answer questions and draw conclusions. The exercise can be concluded with another class discussion to see how initial opinions have changed after working through the activity. This resource has been differentiated for lower Key Stage Three (Impacts 1) and for upper Key Stage Three (Impacts 2) and lower Key Stage Four (Impacts 3) and upper Key Stage Four (Impacts 4).