In this week's questions show, I answer if techno optimism is blinding us to the challenges of spaceflight, why there aren't spacecraft at all the planets right now, could the Great Attractor be dark matter? Links to various raw imagesCassini - https://solarsystem.nasa.gov/raw-images/raw-image-viewer/?order=earth_date+desc&per_page=50&page=0Curiosity - https://mars.nasa.gov/msl/multimedia/raw/#/?slide=2496Dawn - https://solarsystem.nasa.gov/missions/dawn/galleries/images/?page=0&per_page=25&order=created_at+desc&search=&tags=dawn&condition_1=1%3Ais_in_resource_list&category=5100:33 Is techno-optimism blinding us to challenges of spaceflight04:17 Why aren't there spacecraft at all the planets right now? 08:39 Could the Great Attractor be dark matter? 10:21 What's the biggest telescope that could be built on the Moon? 11:50 Open your mind to crop circles13:59 How do you steer a solar sail?