Answer each question in complete sentences and to the best of your ability.
- When we look through a telescope at stars and other things in space, we are seeing light from many years ago. Is it worth observing space if we are actually observing what it was like many years ago?
- What is the difference between forms of energy, for example, potential and kinetic, and sources of energy, for example, tidal and solar?
- Sometimes doctors can test to see if a person will get a disease in the future. Some of these diseases can’t be treated. Should we do these tests?
- Why is it important that scientists think about possible errors in their method or results?