State the name of one planet that has an orbit further away from the Sun than Mars.
State the name of one planet that has an orbit closer to the Sun than Mars.
Mars has an average radius of orbit of 2.3 × 1011 m and an orbital period of 687 Earth days687 \text{ Earth days}687 Earth days. Calculate the average orbital speed of Mars. Give your answer in m/s\text{m/s}m/s.
State the relationship between the orbital speeds of the planets and their distances from the Sun.
Comets are balls of ice and dust. Some comets orbit the Sun in highly elliptical orbits.
State how the speed of a comet changes as it orbits the Sun. Explain your answer using ideas about the conservation of energy.
60 exam-style questions on CIE IGCSE Physics 6.1.2a Contents of the Solar System. Each one has a worked solution and a mark scheme showing where the marks go.