This is obviously not part of the GCSE syllabus. The aim here is just to make mention of one or two stories which might help indirectly with basic astronomy.
- Blue Mars, Kim Stanley Robinson Mars has just won its independence and is in the process of long-term terraforming. The characters also visit Mercury and satellites of the gas planets, as well as occasionally visiting Earth which is suffering a massive rise in sea level (although these visits cause difficulties for Martians accustomed to 0.4g). Statements : The diameter of Mars is 53% of that of Earth's so its surface area is 28% of Earth's and its volume 11% of Earth's. But because of Earth's oceans, Mars has almost an equal area of land as Earth. Its gravity is about 40% of earth's (as already mentioned!)