From Sandy Henderson, Dunblane, Stirling, UK
I applaud Eric Kvaalen’s idea of using solar arrays on the International Space Station as solar sails that might keep it in orbit. Few places would be better suited to testing designs for solar sails. As for the favoured plan to bring down the ISS, I deplore the mindset of those who would scrap a valuable asset because they can’t presently see a future for it (Letters, 19 October).
