1.8K views · 25 reactions | Tomorrow we will see one of the best "opposition of Mars" in many years, but what does this mean and how can you see it? All the planets in the Solar System orbit around the Sun. At certain points during these orbits, the Earth finds itself directly between the Sun and another planet. This is the moment at which that planet is said to be 'in opposition'. Here Hayley explains how you can see Mars on 13 October. | National Space Centre | Facebook