'The Strawberry Window,' and 'The Dragon' Summary

In 'The Strawberry Window,' a man called Bob and his family have moved to Mars. Bob's wife is unhappy and wants to return to Earth. Bob has noticed her increasing sadness and has spent all their savings in an attempt to fix this. He takes his family to the rocket depot and explains to them on the way why they need to stay on Mars. He says that mankind will always be vulnerable on one planet. The Sun will explode one day and destroy Earth, so it is vital that mankind moves on and colonizes new planets. The more places they go, the less chance a freak accident or tragic event could wipe out the whole race. He explains that he misses Earth too, but that it is their duty...